Area List, Douglas Mountain Study Area, Jefferson County, United States.

Eastern Mojave Vegetation

Detailed Area Plant List for Douglas Mountain Study Area, Jefferson County, United States.

Edited by Tom Schweich

This list is assembled from personal collections, herbarium vouchers, and published lists. For California, much of the data is provided by the participants of the Consortium of California Herbaria as indicated by a single dagger “†.” Their web site is at: (http://ucjeps.berkeley.edu/consortium/). For Colorado, much of the data is provided by the Southwest Environmental Information Network as indicated by a double dagger “‡,” which web site is found at (http://swbiodiversity.org). See their respective websites for copyright information and recommended citation formats.

For a complete list of Locations included in this Area List, see the Locations Included section, below.

For a check list, please see: Check List for Douglas Mountain Study Area, Jefferson County, United States.

Equisetaceae

Equisetum arvense L. Field Horsetail. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, In the creek of Guy Gulch, southwest side of County Road 70, 125 m. southwest of the ranch house, 15.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2959.1 14 Jun 2023. ( Golden ) In shaded seep beside creek, with Betula occidentalis, willows , and cottonwoods. Southwest side of the gulch, 680 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3173. 31 Jul 2023. ( KHD00080570^‡ Undist. ) .

Cupressaceae

Juniperus communis L. var. depressa Pursh. Common Juniper. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Open southwest-facing slope between Pinus ponderosa with Penstemon secundiflorus, Potentilla fissa, and Rubus deliciosus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope 32 m. west northwest of the line shack, 1.14 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2997. 23 Jun 2023. ( Golden ) . .

Juniperus scopulorum Sarg. (Syn: Sabina scopulorum Sarg.(Sarg.) Rydb. ) Rocky Mountain Juniper. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Edge of flood plain, between hillslope brush and flood plain trees. Southwest side of the creek and County Road 70, 326 m. south southeast of the ranch house, 15.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2966. 14 Jun 2023. ( Golden KHD ^‡ ) .

Pinaceae

Pinus ponderosa Laws. Ponderosa Pine. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with John Vickery 3319. 6/23/2023. .

Apiaceae

Harbouria trachypleura (A. Gray) J.M. Coult. & Rose. (Syn: Thaspium trachypleurum A. Gray ) Whiskbroom Parsley. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Nose of small southeast plunging ridge, with Heterotheca villosa and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 80 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2940. 6 Jun 2023. ( Golden ) Rocky hillslope with Juniperus communis var. depressa, Pinus ponderosa, and Rubus deliciosus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope 30 m. northwest of the line shack, 1.13 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2995. 23 Jun 2023. ( Golden ) . .

Osmorhiza depauperata Phil. Blunt-Fruit Sweet-Cicely. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Shaded floor of small gulch. Along stream tributary to Guy Gulch, about 310 m. north of County Road 70, near the western boundary of the study area, 17.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2951. 6 Jun 2023. ( Golden ) . .

Pseudocymopterus montanus (A. Gray) J. M. Coult. & Rose. (Syn: Cymopterus lemmonii (J. M. Coult. & Rose) Dorn ) Alpine False Springparsley. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Grasses surrounded by Douglas fir forest, Mertensia lanceolata, Aquilegia coerulea, Fragaria vesca, and Viola canadensis. Edge of forest near the creek in Guy Gulch, southwest side of County Road 70, 1.14 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3023. 3 Jul 2023. ( Golden KHD ^‡ ) .

Asteraceae

Achillea millefolium L. (Syn: A. lanulosa Nutt. , A. m. L. var. alpicola (Rydb.) Garrett , A. m. L. var. lanulosa (Nutt.) Piper , A. m. L. var. occidentalis DC. ) Common Yarrow. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb to 50 cm.;; Leaves alternate, tendrils absent, finely dissected, aromatic when fresh; Inflorescence, heads enclosed by an involucre, in flat-topped clusters; Phyllaries in 2+ series; Receptacles bearing scale-like bracts (paleate); Perianth in 2 or more whorls, parts in 5s; Phyllaries in 2+ series, not all subtending ray flowers; Flowers open, bisexual, two kinds, some with strap-shaped corollas; Petals fused into a tube; Ray flowers, white, lobe ovate; Disc flowers, white; Stamens = in number to corolla lobes; Ovary inferior. Pistils, 1 per flower (Described from Coll. No. 482, 30 Nov 2011, and Coll. No. 1023, 24 Jul 2013).

- Guy Gulch, Tom Schweich, with John Vickery 3274. 6/14/2023. Tom Schweich, with John Vickery 3314. 6/23/2023. . .

Ambrosia tomentosa Nutt. Skeleton-Leaf Bursage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Also collected nearby: Astragalus flexuosus, Silene latifolia, and Dracocephalum parviflorum. Just southeast of a concrete structure, across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3067. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Anaphalis margaritacea (L.) Bentham & Hooker. Western Pearly Everlasting. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Very steep slope among Douglas fir. Steep slope above Guy Gulch, southwest side of the creek and County Road 70, 380 m. south southeast of the ranch house, 15.6 km. (planar) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2972. 14 Jun 2023. ( Golden ) Top of very steep slope above creek, 90 m. southwest of County Road 70, 1.09 km. (geodesic) northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3043.1 3 Jul 2023. . .

Antennaria microphylla Rydb. Littleleaf Pussytoes. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, East side of meadow, edge of forest with aspen, spruce and ponderosa pine, growing with Antennaria parviflora. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 35 m. east northeast of the line shack, 1.08 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3150. 26 Jul 2023. ( KHD00080565^‡ Undist. ) . .

Antennaria parvifolia Nutt. Small-Leaf Pussytoes. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 10 cm., stoloniferous; Stem, tomentose; Leaves, basal and cauline, basal, petiole, gradually expanding into blade, blade, 16 mm. × 6.7 mm. wide, oblanceolate, entire, glandular, tomentose, tips, pointed, cauline, 10 mm. × 2 mm. wide, linear; Inflorescence, heads enclosed by an involucre, #3 per stem, not showy; Involucre, 7 mm. × 4.5 mm. wide, cylindric; Phyllaries, 5+ series, 4 mm. × 2 mm. wide to 8 mm. × 1 mm. wide, green proximally to white (pinkish) distally, tomentose, margins, flat, scarious, tips, rounded; Receptacle, epaleate; Flowers, of 1 kind; Disk flowers, many, 6.5 mm., white; Pappus, many, well-developed, bristles, 8 mm., ±equal; Cypsela, 0.8 mm. × 0.3 mm. wide, brown, glabrous. (Described from Coll. No. 1909, 31 May 2018.)

- Guy Gulch, Lowest northeast-facing hill slope, edge of forest. Southwest side of the creek and County Road 70, 200 m. southwest of the ranch house, 15.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2961. 14 Jun 2023. ( Golden ) . .

Antennaria rosea Greene. Rosy Pussytoes. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 9 cm., stoloniferous 4-5 cm., forming loose mats in wet muddy soil, all sixteen plants collected pistillate (gynoecious?); Leaves, simple, white tomentose both sides, basal, 35 mm. × 9 mm wide, oblanceolate, cauline, 11-13 mm., linear; Inflorescence, >> basal leaves; Involucre, 5.5-7.0 mm.; Bracts (phyllaries), 5.0-6-5 mm. × 1.1-0.7 mm. wide, green at base, purplish band in middle, tips, white, scarious. (Described from Coll. No. 1083, 25 April 2015).

- Guy Gulch, Douglas Mountain Study Area, area along Guy Gulch, about 210 m. above the county road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2947. 6 Jun 2023. ( Golden KHD ^‡ ) Lowest northeast-facing hill slope, edge of forest. Southwest side of the creek and County Road 70, 180 m. southwest of the ranch house, 15.9 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2960. 14 Jun 2023. ( Golden ) Tom Schweich, with John Vickery 3273. 6/14/2023. . .

Arnica cordifolia Hook. Heart-Leaf Leopardbane. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, More seen further up the gulch. Just inside the mouth of a small gulch tributary to Guy Gulch, southwest side of County Road 70, 1.19 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3029. 3 Jul 2023. ( Golden ) . .

Artemisia frigida Willd. Prairie Sagewort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 30 cm., woody at base; Stems many; Leaves alternate, 9 mm., pinnately dissected into 7 parts, silvery hairy; Inflorescence raceme-like, indeterminate, heads 1-3 in axils; Heads have only disk flowers, all alike; Involucre of hairy phyllaries; Phyllaries in 2 series, hairy, not gummy or with tips recurved; Receptacle hairy, not chaffy or bristly; Flowers fertile; Pappus absent; (Described from Coll. No. 1067, 8 Oct 2014).

- Guy Gulch, Tom Schweich, with John Vickery 3317. 6/23/2023. . .

Artemisia ludoviciana Nutt. ssp. incompta (Nutt.) D. D. Keck. White Sagebrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, also collected here: Symphyotrichum porteri, Allium cernuum, Muhlenbergia montana, and Thinopyrum intermedium. Southwest side of County Road 70 and the gulch, 660 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3190. 31 Jul 2023. ( KHD ^‡ Undist. ) . .

Cirsium arvense (L.) Scop. (Syn: Breea arvensis (L.) Lessing ) Canada Thistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 70 cm., tap-rooted; Leaves, cauline, alternate, sessile but not obviously decurrent, 85 mm. × 20 mm. wide, margin sinuate, spiny, adaxial thinly tomentose, abaxial tomentose; Inflorescence, panicle(?); Heads, many, 30±, 15 mm. × 8 mm. dia., disk flowers only, dioecious, staminate heads, pappus < corolla, pistillate heads, pappus > corolla; Phyllaries, many (6-7) series, outer 3 mm. × 1.5 mm. wide, inner 15 mm. × 1 mm. wide, dark dorsal ridge, tips, spinulose, reflexed; Receptacle, soft bristles, 10 mm.; Pappus, plumose bristles (Described from Coll. No. 1512, 24 July 2016).

- Guy Gulch, Colorado Noxious Weed List B. EDDMapS Record ID 11926494. Broken shade up a small gulch 30 m. northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3210. 8 Sep 2023. ( Undist. ) . .

Dieteria bigelovii (A. Gray) D. R. Morgan & R. L. Hartman. (Syn: Machaeranthera b. (A. Gray) Greene , Machaeranthera varians Greene ) Bigelow's Tansy Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 60 cm.; Stem erect, stipitate-glandular, more dense above; Leaves, basal, unknown, cauline, alternate, sessile, 50 mm. × 4-5 mm. wide, reduced above, lance-linear, spinulose toothed; Inflorescence, panicle, heads borne singly on pedicels 10-20 mm.; Involucre, 8 mm. × 12 mm. wide; Phyllaries, 5+ series, imbricate, chartaceous below, green and stipitate-glandular above, tips, acuminate, reflexed; Receptacle, epaleate; Flowers of 2 kinds; Rays, fertile, corolla, tube 4.5 mm. + laminae 10 mm. × 1.5 mm. wide, spatulate, blue; Disk flowers, corolla, 6 mm., yellow; Pappus, capillary bristles, 6 mm.; Cypsela, 3 mm., hairy. Described from Coll. No. 1299, 23 Sep 2015.

- Guy Gulch, With Symphyotrichum porteri. Distance from Golden was measured as 15.8 km in planar mode in error, whereas a more accurate distance would be 12.2 km. measured in geodesic mode. Work or parking area in front of ranch sheds, 40 m. southeast of the Centennial Ranch house, 15.8 km. (geodesic) northwest of Golden. Tom Schweich, with John Vickery 3208. 8 Sep 2023. ( Undist. ) . .

Dieteria bigelovii (A. Gray) D. R. Morgan & R. L. Hartman var. bigelovii. Bigelow's Tansy Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Open southeast-facing slope of ridge above small gulch tributary to Guy Gulch, also here: Helianthus pumilis and Heterotheca villosa. Southwest side of County Road 70 and the gulch, 615 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3180. 31 Jul 2023. ( Undist. ) . .

Erigeron flagellaris A. Gray. Trailing Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 5-6 cm., with scapose inflorescence to 9 cm., spreading by leafy stoloniferous branches; Leaves, basal and cauline, entire, basal, linear-oblanceolate, 35 mm. × 2.5 mm., cauline, linear, 13 mm. × 1.5 mm.; Inflorescence, single heads on scape to 8 cm.; Receptacle epaleate; Phyllaries, 2+series, ±equal, 4 mm., hairy abaxially, ascending multicellular hairs with clear crosswalls, glandular between hairs; Flowers of 2 kinds; Pappus of bristles, 2 mm., + short scales, that of ray and disc flowers alike; Rays, #±80, corolla white, fading lilac, 8 mm. × 0.5 mm.; Disc flowers, corolla yellow, lobes triangular; Achene, short hairy. (Described from Coll. No. 1116, 28 May 2015).

- Guy Gulch, Open grassy slope with Rumex acetosella, Cerastium arvense, Microsteris gracilis, and Bouteloua gracilis. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope just a few meters west of the line shack, 1.12 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2992. 23 Jun 2023. ( Golden KHD ^‡ UCR308414 Error 14.6(b)-7c ) . .

Erigeron speciosus (Lindl.) DC. Aspen Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 75 cm., rhizomatous; Stem, glabrous, to glandular distally, purple at base; Leaves, basal, absent, lower cauline, petiole 20-25 mm. + blade 25-45 mm. × 6-10 mm. wide, elliptic, margin ciliate, upper cauline, sessile, 25-42 mm. × 5.0-7.5 mm. wide, lanceolate, gradually reduced, finely glandular, tips, small rounded tip (apiculate?), margins, entire, ciliate; Inflorescence, >leaves, 2-3 heads per stem, showy; Involucre, 5 mm. × 13 mm. wide, base glandular; Phyllaries, 3± series, 4-5 mm. × 0.5 mm. wide, outer ±= inner, outer green, inner yellow-tan, curved distally, finely glandular; Receptacle, epaleate; Flowers, of 2 kinds; Ray flowers, many, tube 2-3 mm. + blade 10-12 mm. × 0.5-1.0 mm. wide, lavender, or white fading lavender, fertile; Disk flowers, many, tube 2.0-3.3 mm. + lobes 0.5 mm., yellow, open, bisexual; Pappus, two series, short and long, long, 2 mm. sometimes (undescribed) or tawny; Cypsela, 1.3 mm. compressed, brown, hairy. (Described from Coll. No. 2612, 29 July 2021, and Coll. No. 2645, 5 Aug 2021.)

- Guy Gulch, Steep slope below rock outcrop, with Senecio pudicus. Southwest side of the gulch, 690 m. northwest of Centennial Ranch, 12.9 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3175. 31 Jul 2023. ( KHD00080573^‡ Undist. ) . .

Erigeron vetensis Rydb. Early Bluetop Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 12 cm., sparse multicellular hairs with clear crosswalls to 0.8 mm., plus very small (<0.1 mm.) peg-like glands, throughout; Leaves, basal, petiole 45 mm. + blade 65 mm. × 5 mm. wide, narrowly oblanceolate, cauline, reduced in size, #4-5, sessile, 15 mm. × 2.1 mm. wide, oblanceolate; Inflorescence, scapose, 21 cm.; Heads, mostly borne singly; Involucre, 5 mm. × 11 mm. wide; Phyllaries, subequal, in 2 rows, 5 mm. × 0.7 mm. wide, margins not ciliate, tip acuminate; Flowers of 2 kinds, Ray flowers, fertile, corolla, 11 mm. × 1.6 mm. wide, ±white, fading blue; Disk flowers, corolla, 4.0 mm., yellow, lobes triangular, style branch appendages triangular; Pappus, short (0.3 mm.) and long (2.2 mm.) capillary bristles; Cypsela, 1.5-1.6 mm. (Described from Coll. No. 1421, 10 Jun 2016).

- Guy Gulch, Nose of small southeast plunging ridge, with Pediocactus simpsonii, Eriogonum jamesii, and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 100 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2943. 6 Jun 2023. ( Golden ) . .

Gaillardia aristata Pursh. Blanketflower. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm.; Leaves, alternate, entire to toothed; Inflorescence, single heads on peduncles 13-18 cm., flowers of 2 kinds; Phyllaries, 2+ series, 17 mm. × 2.7 mm. wide, lance-linear; Receptacle, epaleate, setae, to 10 mm.; Rays, sterile, corolla, 21 mm. × 10 mm. wide, yellow, deeply 3-lobed; Disk flowers, corolla, 7 mm., purple; Pappus of 6+ aristate scales, 4 mm., awn 2×> body. Described from Coll. No. 1205, 12 Jul 2015.

- Guy Gulch, Tom Schweich, with John Vickery 3353. 7/26/2023. . .

Helianthus pumilus Nutt. Little Sunflower. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm.; Leaves, cauline, alternate, occasionally opposite, then bases conjoined, simple, petiole 7-10 mm. + blade 55-86 mm. × 22-30 mm. wide, lanceolate, flat (not folded), margin, entire to lightly toothed, adaxial, pustular strigose, hairs multicellular, crosswalls clear, abaxial, glandular and strigose; Inflorescence, heads single to few on leafy stems, peduncles to 8-10 cm., hairy, glandular; Involucre, 9 mm. × 16 mm. wide; Phyllaries in 2+ series, similar, 6-10 mm. × 2.0-3.5(4) mm. wide, greene erect, ovate, strigose abaxially, margins ciliate, tip acuminate, not as “stiff” or “tough” as those of Coll. No. 1199; Receptacle, slightly convex, paleate; Disk, 17 mm. wide; Palea, 9 mm., tip, glandular, hairy distally; Flowers, 2 kinds; Ray flowers, sterile, #10-12, corolla, 17-25 mm. × (4)6-9 mm. wide, yellow; Disk flowers, corolla, 4-6 mm., yellow, lobes, #5, 1 mm., yellow, anther appendages reddish-brown; Pappus of few long (2.5-4 mm.) aristate scales; Cypsela, 3.5 mm. × 1.4 mm. wide, quadrangular,not laterally compressed black. Described from Coll. No. 1210, 1426, and 1704.

- Guy Gulch, Open southeast-facing slope of ridge above small gulch tributary to Guy Gulch. Southwest side of County Road 70 and the gulch, 615 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3179. 31 Jul 2023. ( Undist. ) . .

Heliomeris multiflora Nutt. var. multiflora. Showy Golden Eye. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Southeast-facing hill slope abobe the gulch about 285 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3217. 8 Sep 2023. ( Undist. ) . .

Heterotheca villosa (Pursh) Shinners var. nana (A. Gray) Semple. (Syn: Chrysopsis canescens DC. var. nana A. Gray ) (=Heterotheca villosa (Pursh) Shinners) Hairy False Golden Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 50 cm.; Stem, moderately strigose, curved multicellular hairs, proximally eglandular, distally hairy and glandular, but generally hairs exceed glands, Leaves, cauline, alternate, well-distributed along stem, 13-16 mm. × 4-77 mm. wide, elliptic or oblong to obovate or oblanceolate, entire, some margins contorted after drying, 1-veined, distal perpendicular to stems, not densely canescent, generally hairs > glands; Inflorescence heads 1-8 per stem, terminating leafy stems, not subtended by leafy bracts; Heads solitary, with both ray and disk flowers; Phyllaries in 2+ series, unequal, 2-7 mm., tips erect, hairy, glandular; Receptacle epaleate, hemispheric; Rays, sterile, corolla, 9-10 mm. × 1.3 mm. wide, yellow; Disk flowers, corolla, 5.0 mm., yellow; Pappus double, outer narrow scales ≤ 1 mm. (easier to see on mature fruit, in flower will appear as one series of long and short bristles), inner bristles, 5.5-6.5 mm., white, ≥disk flowers, short plumose; Fruit, disk 2.6-3.0 mm. × 1.2 mm. wide, hairy.

- Guy Gulch, Open southeast-facing slope above small gulch tributary to Guy Gulch. Southwest side of County Road 70 and the gulch, 618 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3178. 31 Jul 2023. ( Undist. ) . .

Packera fendleri (A. Gray) W.A. Weber & �. L�ve. (Syn: Senecio fendleri A. Gray ) Fendler’s Ragwort. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, On an old road through forest of aspen, spruce and ponderosa pine, with Sedum lanceolatum, Oxytropis lambertii, Penstemon glaber var. alpinus, and Koeleria macrantha. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 63 m. southeast of the line shack, 1.05 km. west southwest of Mt. Tom, 13.65 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3162. 26 Jul 2023. ( Undist. ) . .

Packera werneriifolia (A. Gray) W. A. Weber & �. L�ve. (Syn: Senecio werneriifolius (A. Gray) A. Gray ) Hoary Groundsel. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, 9-10 cm., tap-rooted; Stem, green, lanate-tomentose throughout; Leaves, cauline, appearing basal, blade, narrowly oblanceolate, 70 mm. × 4 mm. wide, abruptly reduced, giving plant scapose appearance, abaxial, glabrate, adaxial, thinly tomentose, margins, entire, revolute; Inflorescence, flat-topped, heads, #7-10 per stem, not overtopped by leaves; Peduncles, 3-22 mm., tomentose; Involucre, 8 mm. × 8 mm. wide, ovoid, tomentose; Phyllaries, in 2 series, non-imbricate and appearing to be a single series, 6.5 mm. × 1 mm. wide, flat, not clasping ray ovaries, tip, acute, margins of inner phyllaries scarious, calyculi present, green; Flowers, 2 kinds; Ray flowers, #9, tube 3 mm. + blade 4.5 mm. × 2 mm. wide, yellow, fertile; Disk flowers, #40-50, tube 4 mm. + lobes 0.5 mm., yellow, throat expanding gradually; Pappus, many well-developed bristles, 5 mm., ±unequal; Cypsela, immature, 1.5 mm. × 0.5 mm. wide, green, glabrous, beakless. (Described from Coll. No. 2467, 23 May 2021)

- Guy Gulch, Gentle north-facing slope in Douglas fir forest with little to no middlestory. Open shade on a forested hillside above Guy Gulch, 290 m. southwest of County Road 70, 1.15 km. (geodesic) northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich 3040. 3 Jul 2023. ( Golden KHD ^‡ ) . .

Rudbeckia laciniata L. Cut-Leaf Coneflower.. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with Cindy Trujillo and John Vickery 3343. 7/12/2023. . .

Senecio integerrimus Nutt. Columbia Ragwort. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Nose of small southeast plunging ridge, with Juniperus scopulorum, Pediocactus simpsonii, Mertensia lanceolata, and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 80 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2941. 6 Jun 2023. ( Golden ) Open ground amid lodgepole pines. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, in a flat area 143 m. southwest of the line shack, 1.24 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3001. 23 Jun 2023. ( Golden ) Tom Schweich, with John Vickery 3356. 7/26/2023. . .

Senecio pudicus Greene. Bashful Ragwort. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Steep slope above creek, twining through Symphoricarpos sp., with Erigeron speciosus. Southwest side of the gulch, 690 m. northwest of Centennial Ranch, 12.9 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3176. 31 Jul 2023. ( KHD00080572^‡ Undist. ) . .

Solidago missouriensis Nutt. Missouri Goldenrod. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 35-40 cm., generally glabrous throughout; Leaves, basal, unknown, cauline, alternate, petiole 10-45 cm. + blade 100 mm. × 21-22 mm. wide, reduced above, oblanceolate, margin, sparsely scabrous proximally, serrate distally, glabrous, prominently 3(5)-nerved; Inflorescence, crowded panicle; Pedicels, 1 mm.; Bracts, #2, 1.8 mm.; Involucre, 3.0-4.5 mm. × 3-5 mm. wide, obconic; Phyllaries, 2+ series, 2.2-3.5 mm. × 1 mm. wide, graduated, green, margin chartaceous, veins 1; Receptacle, epaleate, conic; Flowers, 2 kinds; Rays, #12, fertile, tube 2 mm. + blade 2.2 mm., yellow; Disk flower, #12, tube 2.8 mm. + lobes 0.7 mm. = 3.5 mm., yellow; Pappus, capillary bristles, 3.0 mm.; Cypsela, 0.4-0.6 mm., glabrous-sparsely hairy. Described from Coll. No. 1255, 26 Jul 2015, and Coll. No. 1519, 29 Jul 2016. Distinguished in part by its glabrous characters and presence of 3 prominent nerves on leaves. Jepson eFlora notes that S. missouriensis Nutt. Is misapplied to S. spectabilis (D. C. Eaton) A. Gray. FNANM states that, in the west, it can be similar to smaller plants of S. spectabilis (13 Sep 2014).

- Guy Gulch, Sunny openings in grass. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 72 m. north of the line shack, 1.07 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3164. 26 Jul 2023. ( Undist. ) . .

Symphyotrichum porteri (A. Gray) G.L. Nesom. (Syn: Aster porteri A. Gray ) Smooth White Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 35 cm., eglandular, generally not hairy; Stem ascending; Leaves, cauline, alternate, sessile, 53 mm. × 3 mm. wide, lance-linear, many rolled, tip pointed, maybe spinulose, generally glabrous except some distal margins; Inflorescence, crowded, ±flat-topped; Heads borne simgly on short pedicels; Involucre, 5 mm. × 8 mm. wide; Phyllaries, 2+series, 3.5 mm. × 0.7 mm. wide, ±equal, inner ≥ outer, mid-vein green, margins white proximally, green distally, tip acute; Receptacle, epaleate, convex (if not conic); Flowers of two kinds; Rays, fertile, corolla, 6.5 mm., white; Disk flowers, corolla, 3.0 mm., yellow; Pappus, bristles, barbed, single, 2.5 mm.; Cypsela, 0.7 mm., sparsely hairy. Described from Coll. No. 1266, 29 Jul 2015.

- Guy Gulch, Lightly shaded floor of gulch. Southwest side of County Road 70 and the gulch, 640 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3187. 31 Jul 2023. ( Undist. ) With Dieteria bigelovii. Distance from Golden was measured as 15.8 km in planar mode in error, whereas a more accurate distance would be 12.2 km. measured in geodesic mode. Work or parking area in front of ranch sheds, 40 m. southeast of the Centennial Ranch house, 15.8 km. (geodesic) northwest of Golden. Tom Schweich, with John Vickery 3207. 8 Sep 2023. ( KHD ^‡ ) .

Betulaceae

Betula occidentalis Hook. (Syn: Betula fontinalis Sarg. ) Water Birch. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Shaded lower terrace just above creek, with Equisteum arvense, willows , and cottonwoods. Southwest side of the gulch, 680 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3174. 31 Jul 2023. ( KHD00080571^‡ Undist. ) .

Boraginaceae

Hackelia floribunda (Lehm.) I. M. Johnst. Many-Flowered Stickseed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Also collected here: Polemonium foliosissimum. Deep shade of a small gulch tributary to Guy Gulch, 145 m. southwest of County Road 70, 1.20 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3034.1 3 Jul 2023. ( Golden ) Around willow with Ribes inerme, Geum macrophyllum, and Scrophularia lanceolata. Around the base of a willow in a former meander of the creek, 130 m. west across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3070. 12 Jul 2023. ( Undist. ) . .

Lithospermum multiflorum Torrey ex A. Gray. Many Flowered Stoneseed. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial � cleistogamous flowers absent. Flowers heterostyled and dimorphic.

- Guy Gulch, Open edge of Douglas fir forest. Limited material, flowers just beginning to open. Terrace above creek in Guy Gulch, southwest side of County Road 70, 1.20 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3028. 3 Jul 2023. ( Undist. ) . .

Mertensia lanceolata (Pursh) DC. Prairie Bluebells. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, with spreading-ascending branches to 20 cm.; Stem, glabrous; Leaves, basal and cauline, basal, petiole 55 mm. + blade 50 mm. × 12.5 mm. wide, lanceolate, distinct lateral veins, papillate adaxially, margin, entire, appressed ciliate; cauline, sessile, 40 mm. × 4 mm. wide, without distinct lateral veins, papillate to strigose (oriented toward apex) adaxially, margin, entire, appressed ciliate; Inflorescence, panicle; Calyx, not divided to base, tube 1.5 mm. + lobes 2-3 mm.; Corolla, tube 4.0-6.5 mm. + lobes 4.5-7.5 mm., free 2.0 mm., limb 5-10 mm., deciduous, blue, small tufts or a ring of hairs near (2.2 mm.) base of throat; Stamens, #5-6, inserted, attached just below (0.5 mm.) throat/fornices; Filaments, 2.0-3.5 mm., strap-shaped, filaments ≥ anthers; Anthers, 1.8-2.3 mm., versatile, yellow; Ovary, 0.7 mm. × 1.3 mm. wide, partially fused to calyx; Style, 7.0-7.5 mm., single, ±≥anthers; Stigma, simple; Fruit, #4 nutlets, 1.7 mm. × 1.5 mm. wide. (Described from Coll. Nos. 1906 & 2035.)

- Guy Gulch, Nose of small southeast plunging ridge, in deep soil under Juniperus scopulorum, with Ribes cereum. Douglas Mountain Study Area, area along Guy Gulch, about 75 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2942.1 6 Jun 2023. ( Golden ) Shaded shoulder of stream bank with Pinus ponderosa. Also collected here: Maianthemum stellatum. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on a stream bank 80 m. south of the line shack, 1.16 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3002. 23 Jun 2023. ( Golden ) Tom Schweich, with John Vickery 3275. 6/14/2023. . .

Oreocarya virgata (Porter) Greene. (Syn: Cryptantha virgata (Porter) Payson ) Miner"s Candle. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with Cindy Trujillo and John Vickery 3344. 7/12/2023. On a small berm from some long-ago disturbance. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 140 m. north northeast of the line shack, 1.04 km. west southwest of Mt. Tom, 13.9 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3171. 26 Jul 2023. ( Undist. ) .

Brassicaceae

Alyssum simplex Rudolphi. (Syn: Alyssum minus Rothm. , Alyssum parviflorum Fisch. ex M.Bieb. ) European Madwort. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, tap-rooted, to 12-30 cm., stellate hairy throughout (typically doubly branched and 8-pointed); Stem branched at base, ascending; Leaves basal, withered at flowering, appear compound, cauline, alternate, 14-28 mm. × 3.5-5.0 mm., oblanceolate, margin entire, tip acute, sessile or vaguely short-petioled; Inflorescence not bracted; Pedicels, in fruit, 4.5 mm.; Sepals, 4, 2 mm. × 0.7 mm. wide, deciduous in fruit; Petals 2.9-3.0 mm., yellow fading white,clawed, entire to tip slightly notched; Stamens, 2.5-2.6 mm.; Filaments, 2.3 mm., winged proximal 1.5-1.8 mm., not toothed; Style persistent, 1.3 mm., few hairs at base; Fruit round, 3.5-5.0 mm. × 5.6 mm. wide, margin entire, compressed parallel to the replum, hairy, hairs thinning as fruit matures; Ovules, 4 (most keys and descriptions say 2 when they give a specific number, but the genus is described as having 1-2[4] ovules). (Described from Clyde Golden, 25 Jun 2011, Coll. No. 1090, 30 Apr 2015, and Coll. No. 1367, 24 May 2016).

- Guy Gulch, With Pinus ponderosa, Physaria montana, Pediocactus simpsonii, and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 75 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2938.1 6 Jun 2023. ( Golden ) . .

Arabis pycnocarpa M. Hopkins var. pycnocarpa. (Syn: Arabis hirsuta (L.) Scop. , Arabis hirsuta (L.) Scop. var. pycnocarpa (M. Hopkins) Rollins ) Cream Flower Rockcress. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, South-facing slope, with Artemisia frigida, Cirsium undulatum, and Ribes cereum. Douglas Mountain Study Area, area along Guy Gulch, north side of Jefferson County Road 70 and near western boundary, 17.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2935. 6 Jun 2023. ( Golden KHD ^‡ ) Open grasses. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 28 m. south of the line shack, 1.13 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3005. 23 Jun 2023. ( Golden ) . .

Barbarea vulgaris R. Br. Garden Yellowrocket. CalPhotos. Jepson eFlora. SEINet Taxon.

Probably a biennial or perennial, to 40 cm., terrestrial but growing in flowing water, glabrous throughout; Leaves, lower cauline, 150 mm. × 45 mm. wide, pinnafitid, lyrate, lobes, #9, terminal lobe 47 mm. × 40 mm. wide, auriculate, auricles, glabrous, leaves reduced upward, upper cauline, sessile, 35 mm. × 18 mm. wide, lobes, 3; Inflorescence, not bracted; Flowers, radial; Sepals, 2.5 mm. × 1.8 mm. wide, ovate, rows, #1, color, yellow; Petals, 6 mm., obovate, claw not conspicuously differentiated from blade, margin, entire, color, yellow; Stamens, #6; Filaments, 4 mm., plain; Anthers, 1 mm.; Fruit, pedicels, 5 mm., glabrous, mature, 19.5 mm. × 0.5 mm. wide, spreading, glabrous. (Described from Coll. No. 1818, 16 May 2018.)

- Guy Gulch, Partly sunny location amid hillside brush and floodplain trees. Southwest side of the creek and County Road 70, 326 m. south southeast of the ranch house, 15.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2965. 14 Jun 2023. ( Golden ) . .

Boechera spatifolia (Rydb.) Windham & Al-Shebaz. Spoonleaf Rockcress. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, 45 cm. to 50 cm., hairs, simple, occasional forked hairs at base of stem; Leaves, basal, simple, petiole, 15 mm., blade 18 mm. × 5.5 mm. wide, margin, toothed, ciliate, tip, acute, cauline, 18 mm. × 1.3 mm. wide, auriculate, 1⁺mm., linear, entire; Inflorescence, elongating; Sepals, 1 row; Petals, 3 mm. × 0.7 mm. wide, color, white; Fruit, pedicels, 10 mm., spreading, body, 45 mm., × 1.3 mm. wide, descending or pendant; Ovules, biseriate. (Described from Coll. No. 3042, 3 July 2023.)

- Guy Gulch, Open forest slope above Guy Gulch, 130 m. southwest of County Road 70, 1.09 km. (geodesic) northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3042. 3 Jul 2023. ( Golden KHD ^‡ ) . .

Camelina microcarpa Andrz. ex DC. Little-Podded False Flax. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, terrestrial, herb, 45 cm. to 80 cm. tall; Stem, erect, mostly single, some branched mid-stem, proximal, simple and forked hairs, distal, glabrous; Leaves, basal, absent or withered, cauline, #11-25, sessile, distal basally lobed 1.2 mm., 26-62 mm. × 6.5-10 mm. wide, reduced above, lanceolate, hairs simple and forked; Inflorescence, to 220 mm. × 35 mm. wide, not bracted, not one-sided; Flowers, radial; Pedicels, 4-8 mm., glabrous; Sepals, #4, rows, #1, 2.4-2.7 mm. × 0.8-1 mm. wide, ovate, color, green, margin chartaceous, tip purplish, abaxially hairy; Petals, 3.7-4.0 mm. × 0.7-0.9 mm. wide, oblong-spatulate, margin, entire, color, yellow; Stamens, #6, 3 mm.; Filaments, plain or maybe very narrowly winged; Anthers, 0.7 mm., ovate; Ovary, 1.8 mm. × 0.9 mm. wide; Style, 0.8 mm.; Stigma, capitate, 0.4 mm. wide; Fruit (mature), pedicels, 15 mm., 3 × than fruit, spreading, 5 mm. × 3.2-3.5 mm. wide, wider above middle, somewhat flattened, parallel to replum, coriaceous, short-winged (or strong-margined), valve mid-vein apparent but not prominent; Seeds, many, 1.0 mm. × 0.7 mm. wide, angled, papillate (Described from Coll. No. 1876 and 1883).

Draba nemorosa L. Woodland Whitlow Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual terrestrial herb, 11 to 25 cm., hairs vary: none, simple, forked, but not dolabriform; Stem, proximal, hairs simple and forked, distal, glabrous; Leaves, basal and cauline, Basal, simple, 12 mm. × 4.5 mm. wide, hairs forked; Cauline, #5-6, sessile, 11 mm. × 4 mm. wide, sparsely dentate, hairs, simple and forked; Inflorescene, raceme; Sepals, rows, #1, 1.3 mm. × 0.7 mm. wide, ovate, color, green turning yellow, abaxial hairs wavy; Petals, 2 mm. × 0.7 mm. wide, spoon-shaped, margin entire, color, yellow; Stamens, #4 or 6, 1.3 mm.; Anthers, 0.3 mm.; Style, very short; Fruit, pedicels, 20 mm., puberulent, body, 7 mm. × 2 mm. wide, ascending, short straight appressed hairs (Described from Coll. No. 1821, 16 May 2018).

Draba streptocarpa A. Gray. Twisted-fruit Whitlow-grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial (short-lived?), to 40 cm., hairs various combinations of simple and forked, but not dolabriform or stellate; Leaves, basal, withered, cauline, simple, sessile, lanceolate, 30 mm. ×7 mm. wide, diminishing gradually, margin entire; Inflorescence, raceme, ebracteate; Sepals, #4, 1 row, 2.4 mm. × 1 mm. wide, oblong, color, green, margin scarious, abaxially hairy; Petals, 3.5 mm. × 1.4 mm. wide, obovate, entire, yellow; Anthers, 0.4 mm., ovate; Style, 0.7 mm.; Stigma, capitate; Fruit, pedicels, 12 mm., ascending, body, 10.5 mm. × 2.2 mm. wide (4.77:1), pubescent (maybe slightly more pubescent along margin but not “glabrous with simple hairs along the margin”). (Described from Coll. No. 3031, 3 Jul 2023.)

- Guy Gulch, Deep shade of a small gulch tributary to Guy Gulch, 105 m. southwest of County Road 70, 1.19 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3031. 3 Jul 2023. ( Golden KHD ^‡ ) . .

Erysimum capitatum (Hook.) Greene. Sanddune Wallflower. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial or at least biennial, 16 cm. 25-45 cm., hairs dolabriform throughout; Root, tap; Stems, erect, leafy, proximal not woody hairs as above; Leaves, basal and cauline, basal, petiole, indistinct, ±10 mm., + blade, 50-100 mm. × 2.5-3 mm. wide, narrowly oblanceolate, margin 1-3 shallowly pinnate dentate, cauline, nearly sessile, 42 mm. × 2.5 mm. wide, ±linear, margin, entire, reduced distally; Inflorescence, raceme 130 mm. × 45 mm. wide, not bracted; Pedicels, 3-6 mm., elongating as flower matures, ascending; Flowers, radial; Sepals, #4, rows, 1, 7 mm. × 1-1.5 mm. wide, narrow and wide pairs opposite, lateral pair basally saccate; Petals, claw, 10-11 mm. + blade 6-9 mm. × 4-6 mm. wide, spoon-shaped, margin, entire, color, yellow, orange; Stamens, #6, 11 & 15 mm., tetradynamous (2 short, 4 long); Anthers, 4.5 mm.; Ovary, 4 mm.; Style, 9 mm.; Stigma, capitate; Fruit, 17-34 mm. × 1 mm. wide, 4-angled, ascending, hairy as above; Seeds, unknown (Described from Coll. Nos. 206, 1835, & 2306).

- Guy Gulch, Small ridge between two smaller gulches, deep shade of a gulch tributary to Guy Gulch, 265 m. southwest of County Road 70, 1.23 km. (geodesic) northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3038. 3 Jul 2023. ( Golden ) . .

Physaria montana (A. Gray) Greene. (Syn: Lesquerella montana (A. Gray) S. Watson ) Mountain Bladderpod. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, rosette to 5 cm. dia., flowering stems to 14 cm., not in alpine environment, eastern slope, hairs stellate throughout; Leaves, basal, rosette, 9 mm. × 6.5 mm., ovate, entire, petiole, 12 mm., cauline, 10 mm., appearing secund, narrowly oblanceolate; Inflorescence, exceeding leaves; Pedicels, in fruit, ascending; Fruit, 5 mm. × 2 mm., ovate-elliptic, hairs stellate, apex entire (not notched, although these immature). (Described from Coll. No. 1081, 23 Apr 2015).

- Guy Gulch, With Pinus ponderosa, Pediocactus simpsonii, and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 75 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2938. 6 Jun 2023. ( Golden ) Tom Schweich, with John Vickery 3316. 6/23/2023. . .

Physaria vitulifera Rydb. Bull. Torrey Bot. Club 28: 278. 1901. (Syn: P. vitulifera � bellii ) Roundtip Twinpod. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, terrestrial herb, caespitose, stellate hairy throughout, flowering branches to 15 cm.; Roots, tap; Stem, scapose, hairs as above; Leaves, basal and cauline, basal, petiole 10-35 mm. + blade 22-24 mm. × 8-14 mm. wide, elliptic, weakly pinnately lobed, to few basal leaves with a single pair of teeth, otherwise entire, tip barely acuminate, cauline, alternate, nearly sessile, 13-22 mm. × 4-4.5 mm. wide, oblancelate, margin entire; Pedicel, 5 mm., ascending, becoming s-shaped in fruit; Sepals, #4, 5-7 mm. × 1.5 mm. wide, lanceolate, green, hairy as above; Flowers, Petals, #4, 10 mm. × 2-2.5 mm. wide, obovate, margin entire, color yellow; Stamens, #6 (4 long, 2 short), 6-8 mm.; Filaments, 4.5-6 mm., pair of short filaments slightly winged proximal ½; Anthers, 1.5 mm., saggitate (?); Ovary, 2 mm. × 1.8 mm. wide; Style, #1, 4-6.4 mm., persistent, not elongating in fruit; Fruit, pedicels, 18-20 mm, longest sigmoid, hairs as above, mature fruit, didymous, 3-4.5 mm. × 4 mm. wide, round, apical sinus well-developed, basal sinus much less so, hairy as above; Ovules, 4 per ovary (Described from Coll. No. 1345, 12 May 2016 and Coll. No. 1828, 16 May 2018). Some will key to P. bellii in Ackerfield (2015) at couplet 17 per the shape of the basal leaves, which can be entire to very shallowly once dentate. However, FNANM sends this in the direction of P. vitulifera at couplet 12 based on the relative development of the basal and apical sinuses of the fruit.

- Guy Gulch, Open southeast-facing rocky slope Mouth of a small gulch tributary to Guy Gulch, southwest side of the creek and County Road 70, 530 m. south southeast of the ranch house, 15.5 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2969. 14 Jun 2023. ( Golden KHD ^‡ ) . .

Rorippa palustris (L.) Besser. (Syn: R. islandica (Oeder ex Murray) Borbas ) Bog Yellow-Cress. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Streambed, waterlogged but not flowing. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 27 m. northeast of the line shack, 1.08 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3148. 26 Jul 2023. ( KHD00080564^‡ Undist. ) .

Cactaceae

Pediocactus simpsonii (Engelm.) Britton & Rose. (Syn: Echinocactus simpsonii Engelm. , Pediocactus simpsonii (Engelm.) Britton & Rose var. minor (Engelm.) Cockerell ) Mountain Ball Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with John Vickery 3318. 6/23/2023. .

Campanulaceae

Campanula rapunculoides L. Rampion Bellflower. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Nearly all vegetative, beside stream, rooted in moss. EDDMapS Record ID 11942190. In the gulch about 55 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3214. 8 Sep 2023. ( KHD ^‡ Undist. ) . .

Campanula rotundifolia L. Harebell. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm.; Leaves, basal, ?, cauline, alternate, ±lance-linear, 52 mm. × 2.5 mm. wide; Inflorescence, solitary and loose racemes; Pedicel, 9 mm.; Calyx, tube 2.5 mm. + 5 lobes 2.5 mm. = 5.0 mm.; Corolla, 13 mm, blue-purple; Capsule, nodding, 5.5 mm. × 4.5 mm. wide, opening by pores near the base. Described from Coll. No. 1246, 24 July 2015.

- Guy Gulch, East side of meadow, edge of forest of aspen, spruce and ponderosa pine. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 53 m. east northeast of the line shack, 1.06 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3154. 26 Jul 2023. ( Undist. ) .

Cannabaceae

Humulus lupulus L. Common Hops. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, In a culvert with flowing water on the northeast side of County Road 70, 35 m. south of the Centennial Ranch house, 12.2 km. (geodesic) west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3209. 8 Sep 2023. ( KHD ^‡ Undist. ) .

Caprifoliaceae

Symphoricarpos rotundifolius A. Gray. (Syn: S. oreophilus A. Gray , S. rotundifolius A. Gray var. parishii (Rydb.) Dempster , S. rotundifolius A. Gray var. rotundifolius , S. vaccinioides Rydb. ) Roundleaf Snowberry. CalPhotos. Jepson eFlora. SEINet Taxon.

Shrub, to 70 cm.; Leaves, opposite, 12 mm. × 9 mm. wide, ovate, margin entire; Inflorescence, terminal racemes on short branches; Calyx, 1.5 mm.; Corolla, tube 10 mm. + lobes 1.7 mm., color ochroleucus, few hairs near base of tube (around the style); Stamens, #5; Filaments, free 2 mm.; Ovary, inferior; Style, 3.5 mm., glabrous; Fruit, berry, white. Described from Coll. No. 1654, 1 Jun 2017.

- Guy Gulch, Open grassland with a few Douglas fir and aspens. Terrace above creek in Guy Gulch, southwest side of County Road 70, 1.17 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3025. 3 Jul 2023. ( Golden ) .

Caryophyllaceae

Cerastium arvense L. ssp. strictum Gaudin. (Syn: Cerastium strictum L ) Field Chickweed. CalPhotos. Jepson eFlora. SEINet Taxon.

Common early-flowering perennial, to 20 cm.; Leaves, opposite, broadly linear, 15 mm. × 3 mm. wide, stipules absent, tufts of leaves in lower axils; Sepals free; Petals >> sepals, white, notched; Styles (4)5.

- Guy Gulch, Also collected here: Achillea millefolium, Artemisia frigida, Physaria montana, Microsteris gracilis, and Boutelous gracilis. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope just a few meters north of the line shack, 1.12 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2993. 23 Jun 2023. ( Golden ) Bank of stream with aspen, Douglas fir, and ponderosa pine, also collected here: Nassella viridula. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 260 m. north of the line shack, 1.11 km. west southwest of Mt. Tom, 13.9 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3169.1 26 Jul 2023. . .

Silene latifolia Poir. (Syn: Lychnis alba Mill. , Melandrium dioicum (L.) Cosson & Germain ) Bladder Campion. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Most have been eaten. Around the base of a concrete structure, across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3065. 12 Jul 2023. ( Undist. ) . .

Stellaria longipes Goldie ssp. longipes. (Syn: S. l. Goldie var. l. ) Longstalk Starwort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 20 cm.; spreading by rhizomes, without tuber-like thickening or vertical fleshy root; Leaves opposite; Stipules 0; Inflorescence panicle; Flowers 4-9(10); Pedicels ascending; Sepals free; Petals 2-lobed, > sepals; Fruit a capsule, ovoid (turns wetting solution purple); Seed many, 0.8 mm, ovoid, light brown, slightly rugose (Described from Coll. No. 862, 23 Jun 2012).

- Guy Gulch, In still water beside creek, with Portulaca oleracea and Noccaea fendleri. Same as Coll. No. 3145. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 35 m. northeast of the line shack, 1.09 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3006. 23 Jun 2023. ( Golden ) In the muddy, wet, but not flowing, creek bed; also here: Montia chamissoi, Veronica peregrina, and Potentilla norvegica. Same as Coll. No. 3006. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 40 m. northeast of the line shack, 1.09 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3145. 26 Jul 2023. ( Undist. ) .

Crassulaceae

Sedum lanceolatum Torr. (Syn: Amerosedum lanceolatum (Torr.) A. L�ve & D. L�ve ) Spearleaf Stonecrop. CalPhotos. Jepson eFlora. SEINet Taxon.

Type collected by Edwin James on the Long Expedition, described by Torrey, 1827.

- Guy Gulch, On the edge of an old road through forest of aspen, spruce and ponderosa pine, with Packera fendleri, Oxytropis lambertii, and Penstemon glaber var. alpinus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 79 m. east northeast of the line shack, 1.04 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3157. 26 Jul 2023. ( Undist. ) .

Ericaceae

Arctostaphylos uva-ursi (L.) Sprengel. (Syn: Arctostaphylos uva-ursi (L.) Sprengel ssp. adenotricha (Fernald & J.F.Macbr.) Calder & Roy L.Taylor ) Bearberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Base of small Ponderosa pine, also here: Cirsium arvense, Campanula rapunculoides, Lathyrus latifolia, and Agrostis stolonifera. In the gulch about 45 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3213. 8 Sep 2023. ( KHD ^‡ Undist. ) little bit of green fruit Tom Schweich, with John Vickery 3358. 7/26/2023. . .

Pyrola asarifolia Michx. (Syn: Pyrola rotundifolia L. ssp. asarifolia (Michx.) A. L�ve ) Liverleaf Wintergreen. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, On the floor of the gulch, also collected here: Circaea alpina, Ranunculus abortivus, Prosartes trachycarpa, and Piptatherum micranthum. Small forested gulch tributary to Guy Gulch, 227 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3084. 12 Jul 2023. ( KHD ^‡ ) . .

Vaccinium L. Blueberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, In a thicket under Betula occidentalis, Ribes cereum, and Rubus deliciosus. Compare to Coll. No. 3112 and 3139, Vaccinium sp. from Lake County. Abandoned stream channel of the creek in Guy Gulch, southwest side of County Road 70, 1.13 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3021. 3 Jul 2023. ( KHD ^‡ ) .

Euphorbiaceae

Euphorbia brachycera Engelm. (Syn: Tithymalus brachyceras (Engelm.) Small ) Horned Spurge. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 25-30 cm., glabrous throughout; Stem, erect, herbaceous; Leaves, alternate, sessile, lanceolate, 16 mm. × 8 mm. wide, margin entire, tip acute, green throughout; Flowers, arranged in a cyathium, glands entire with “horns” on either side. (Described from Coll. No. 2485, 2 June 2021.)

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, with: Dieteria bigelovii, Helianthus pumilis, Heterotheca villosa, and Bromus lanatipes. Southwest side of County Road 70 and the gulch, 620 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3182. 31 Jul 2023. ( Undist. ) .

Fabaceae

Astragalus alpinus L. Alpine Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 12 cm., caulescent, hairs basifixed; Leaves, cauline, stipules, 5 mm., connate opposite petiole, alternate, to 80 mm., compound, leaflets, #21, 5 mm. × 3 mm. wide, ovate; Calyx, tube 2 mm. + lobes 1 mm. mostly black hairy, few white hairs; Flowers, spreading to deflexed; Banner, 5 mm + 4 mm. reflexed, blue; Wings, 8 mm. yellowish-white, apex obtuse; Keel, 8.5 mm., > wings, blue distally; Fruit, unknown. (Described from Coll. No 1471, 29 June 2016).

- Guy Gulch, East side of meadow, edge of forest af aspen, spruce and ponderosa pine. Circumboreal. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 53 m. east northeast of the line shack, 1.06 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3151. 26 Jul 2023. ( KHD00080566^‡ Undist. ) Sunny meadow, also collected here, Oreocarya virgata and Monarda fistulosa. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 128 m. north of the line shack, 1.07 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3168. 26 Jul 2023. ( Undist. ) . .

Astragalus flexuosus G. Don. Flexible Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, decumbent to ascending stems, to 30-50 cm., not vine-like, caulescent, appressed basifixed hairy throughout; Leaves, cauline, compound, odd pinnate, leaflets ±15-17, terminal leaflet not modified into tendril, stipules, entire, not lobed at base, ~~not connate~~ (slightly) connate on side opposite to petiole, leaflets, 11-12 mm. × 2-4 mm. wide, oblong, notched, terminal leaflet 7 mm. < uppermost pair 8 mm.; Inflorescence, raceme, arising from axils; Calyx, 4 mm., tube >> lobes,not inflated in fruit; Flower, zygomorphic, banner, 9 mm., wings (2), 9 mm., keel, 5.5 mm., <wings, not beaked; Style, 3 mm., glabrous, persistent; Fruit, 9 mm. × 4.5 mm., substipitate 1 mm., not inflated, compression lateral sparse appressed hairs. Described from Coll. No. 1148, 15 Jun 2015, and Coll. No. 1384, 1 June 2016.

- Guy Gulch, Open flat, possible former parking area across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3064. 12 Jul 2023. ( Undist. ) . .

Astragalus laxmannii Jacq. var. robustior (Hook.) Barneby & S. L. Welsh. (Syn: Astragalus adsurgens Pall. ) Prairie Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm., caulescent, hairs dolabriform; Leaves, cauline, compound, leaflets, #17, 17 mm. × 5 mm. wide, elliptic, tip cuspidate, terminal leaflet jointed to rachis; Calyx, tube 6 mm. + lobes 5 mm. = 11 mm.; Flowers, 14 mm., whitish; Legume, more erect than flower (Described from Coll. No. 1400, 8 June 2016).

- Guy Gulch, Beside an old road through forest of aspen, spruce and ponderosa pine, with Packera fendleri, Sedum lanceolatum, Oxytropis lambertii, Penstemon glaber var. alpinus, and Koeleria macrantha. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 80 m. east northeast of the line shack, 1.04 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich 3160. 26 Jul 2023. ( Undist. ) . .

Astragalus miser Douglas ex. Hook. var. oblongifolius (Rydb.) Cronquist. Timber Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, On an old road through forest of aspen, spruce and ponderosa pine, with Oxytropis lambertii and Packera fendleri. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 61 m. east northeast of the line shack, 1.05 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3155. 26 Jul 2023. ( KHD00080568^‡ Undist. ) . .

Astragalus parryi A. Gray. Parry's Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Steep slope, sunny, southeast aspect. Steep slope above Guy Gulch, southwest side of the creek and County Road 70, 490 m. south southeast of the ranch house, 15.5 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vikery 2970. 14 Jun 2023. ( Golden KHD ^‡ ) . .

Astragalus shortianus [Nutt. ex] Torr. & A.Gray. Short's Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 10 cm., acaulescent; Leaves, compound, petiole, 50 mm., blade, 90 mm. × 37 mm. wide, leaflets, #13, 17 mm. × 10 mm. wide, terminal leaflet not a tendril, petiole, rachis, and leaflets with appressed stiff straight hairs; Inflorescence, not an umbel; Calyx, tube 6 mm. + lobes 4 mm., hairs similar; Flower, zygomorphic, banner 22 mm., wings 18 mm., clawed, keel, 22 mm., tip obtuse; Fruit, 35 mm. × 10 mm. wide, falcate, appressed stiff basifixed straight hairs (Described from Coll. No. 1826, 16 May 2018).

- Guy Gulch, Nose of small southeast plunging ridge. Seems to be arranged in little colonies of 5-6 plants. Open grassy slope with some Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 120 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2944. 6 Jun 2023. ( Golden KHD ^‡ ) . .

Lathyrus latifolius L. Perennial Pea Vine. CalPhotos. Jepson eFlora. SEINet Taxon.

Vine, Stem winged to 3 mm., Leaves pinnate compound, main leaf axis extended as tendril, Leaflets 2, Inflorescence of 9-11 flowers, Sepals fused at base, Flower bilateral, Corolla 20 mm., wing 33 mm. wide, Stamens 10, Filaments top free, bottom 9 fused (Described from Collection No. 884, 17 August 2012).

- Guy Gulch, In the open beside stream, also here: Cirsium arvense, Campanula rapunculoides, Arctostaphylos uva-ursi, and Agrostis stolonifera. In the gulch about 45 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3212. 8 Sep 2023. ( KHD ^‡ Undist. ) . .

Oxytropis lambertii Pursh. Purple Locoweed. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, acaulescent, mostly dolabriform hairs (one arm much shorter than the other); Leaves, basal, pinnately compound, leaflets #17, terminal leaflet present; Inflorescence, raceme, peduncle 30 cm., pedicels very short; Bracts, 7 mm. × 1.6 mm. wide, green, lanceolate; Calyx, tube 7 mm. + lobes 4 mm. = 11 mm.; Flower, zygomorphic, various shades of magenta to purple, banner, 17 mm., wings, 16 mm., keel, 13 mm., blades united enclosing stamens, recurved beak; Stamens, #10, diadelphous (Described from Coll. No. 1385, 1 June 2016).

- Guy Gulch, Beside an old road through forest of aspen, spruce and ponderosa pine, with Packera fendleri, Sedum lanceolatum, Penstemon glaber var. alpinus, and Koeleria macrantha. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 70 m. east northeast of the line shack, 1.04 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3159. 26 Jul 2023. ( Undist. ) .

Gentianaceae

Frasera speciosa Griseb. (Syn: Swertia radiata (Kellogg) Kuntze ) Elkweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, beetle eating pollen Tom Schweich, with John Vickery 3357. 7/26/2023. .

Geraniaceae

Geranium caespitosum James. Pineywoods Geranium. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Perhaps an artificial pile of rocks, possibly containing a spring, with Ribes cereum. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, in a pile of rocks 25 m. southwest of the line shack, 1.14 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3004. 23 Jun 2023. ( Golden ) .

Grossulariaceae

Ribes cereum Douglas. Wax Currant. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Perhaps an artificial pile of rocks, with Geranium caespitosum. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, in a pile of rocks 25 m. southwest of the line shack, 1.14 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3003. 23 Jun 2023. . .

Ribes inerme Rydb. White Stem Gooseberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, At the base of a willow in an abandoned meander of the creek, with Hackellia floribunda, Geum macrophyllum, and Scrophularia lanceolata. Around the base of a willow in a former meander of the creek, 135 m. west across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3071. 12 Jul 2023. ( Undist. ) .

Hydrangeaceae

Jamesia americana Torr. & A. Gray var. americana. Fivepetal Cliffbush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Small ridge between two smaller gulches, shade of a gulch tributary to Guy Gulch, 280 m. southwest of County Road 70, 1.23 km. (geodesic) northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3039. 3 Jul 2023. ( Golden ) .

Lamiaceae

Dracocephalum parviflorum Nutt. American Dragonhead. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Side of concrete structure, also collected here: Ambrosia tomentosa, Silene latifolia, and Astragalus flexuosus. Around the base of a concrete structure, across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3066. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Monarda fistulosa L. Wild Bergamot. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Sunny meadow, also collected here, Oreocarya virgata and Astragalus alpinus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 128 m. north of the line shack, 1.07 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3167. 26 Jul 2023. ( Undist. ) . .

Scutellaria brittonii Porter. Britton's Skullcap. CalPhotos. Jepson eFlora. SEINet Taxon.

Montiaceae

Montia chamissoi (Spreng.) Greene. (Syn: Crunocallis c. (Ledeb. ex Spreng.) Rydb. ) Toad Lily. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, In still water beside the creek, 115 m. west across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3073. 12 Jul 2023. ( KHD ^‡ Undist. ) Muddy, wet but not flowing creek bed. Meadow north of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 40 m. northeast of the line shack, 1.09 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3144. 26 Jul 2023. ( Undist. ) .

Nyctaginaceae

Mirabilis linearis (Pursh) Heimerl. (Syn: Oxybaphus linearis (Pursh) B. L. Robinson ) Narrowleaf Four O'Clock. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 1 m.; Stem, ascending through brush, glabrous below; Leaves, cauline, alternate, sessile, 90 mm. × 5 mm. wide, linear; Involucre, 15 mm., hairs with pale crosswalls; Flowers, 3 per involucre; Fruit, 4 mm. × 2.2 mm., obovate, ribs 4, hairy. Described from Coll. No. 1273, 30 Jul 2015.

- Guy Gulch, Tom Schweich, with Cindy Trujillo and John Vickery 3345. 7/12/2023. . .

Mirabilis nyctaginea (Michx.) MacMill. (Syn: Allionia nyctaginea Michx. , Calymenia nyctaginea (Michx.) Nutt. , Oxybaphus nyctagineus (Michx.) Sweet ) Heartleaf Four O'Clock. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, also collected here: Dieteria bigelovii, Orobanche fasciculata, Polygonum douglasii, and Muhlenbergia montana. Southwest side of County Road 70 and the gulch, 635 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3186. 31 Jul 2023. .

Onagraceae

Circaea alpina L. Small Enchanter's Nightshade. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Large patch in deep shade on floor and south slope of gulch. Small forested gulch tributary to Guy Gulch, 205 m. southwest across County Road 70 from the Centennial Ranch house, 2.52 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3081. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Epilobium ciliatum Raf. Fringed Willowherb. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Rooted in stream. In the gulch about 140 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3216. 8 Sep 2023. ( Undist. ) . .

Gayophytum ramosissimum Torr. & A. Gray. Pinyon Groundsmoke. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Annuals found on dry soil, top of gopher mounds. Mouth of a small forested gulch tributary to Guy Gulch, 140 m. southwest across County Road 70 from the Centennial Ranch house, 2.55 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo 3088. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Oenothera biennis L. King's-Cureall. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial (biennial?), to 60 cm., hairy throughout, hairs lacking red pustular bases; Stem, leafy; Leaves, basal, unknown, cauline, 90-115 mm. × 23-35 mm., elliptic to falcate, margin shallowly dentate, tip acute; Sepals, 11 mm., spreading to reflexed in maturity, tips barely free in bud; Flowers, solitary in leafy bracteate spike, petals, 10 mm., obovate, yellow, fading both orange and pink; Stigma, 4-lobed; Capsules, 17-21 mm., not mature (Described from Coll. No. 2416, 11 Aug 2020). Accepted by Ackerfield (2015). Will key to O. villosa in Weber & Wittman (2012) wherein this taxon is not recognized. Native to central and eastern US and the Pacific coast, but not to Colorado, Idaho, Wyoming, Utah, or Arizona.

- Guy Gulch, Placed in O. biennis on the strength of long hairs and short glandular hairs on the ovary, but see Ackerfield (2022) note regarding presence of O. biennis in Colorado. Around the base of a willow in a former meander of the creek, 125 m. west across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3072. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Oenothera cespitosa Nutt. ssp. macroglottis (Rydb.) W.L. Wagner. Tufted Evening Primrose. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Steep rocky hillside, below a rock outcrop and an Acer glabrum Steep slope above Guy Gulch, southwest side of the creek and County Road 70, 406 m. south southeast of the ranch house, 15.6 km. (planar) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2971. 14 Jun 2023. ( Golden ) . .

Oenothera coronopifolia Torr. & A. Gray. Crownleaf Evening Primrose. Hierba de San Juan.. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with Cindy Trujillo and John Vickery 3342. 7/12/2023. Roadside, Golden Gate Canyon Road (County Road 70), 1.10 km. (geodesic) northwest of Centennial Ranch house, 13.25 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3044. 3 Jul 2023. ( Golden KHD ^‡ ) . .

Oenothera villosa Thunb. Hairy Evening Primrose. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 25 cm., ±straight hairy throughout; Stem, eglandular, villous, hairs with red pustular bases; Leaves, cauline, alternate, sessile, 55 mm. × 12 mm. wide, elliptical, reduced above, entire, very shallowly toothed; Inflorescence, leafy bracteate spike; Sepals, #4, 13 mm., reflexed; Floral tube, 24 mm.; Petals, #4, 9 mm. × 5 mm. wide, yellow fading pink, obovate, entire; Stigma, lobes #4; Capsules, 25-33 mm.; Seeds, 0.8 mm., squarish, glabrous throughout. Described from Coll. No. 1271, 29 July 2015.

- Guy Gulch, Sunny meadow. Probably var. strigosa if infraspecific names are to be applied. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 43 m. northeast of the line shack, 1.08 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3147. 26 Jul 2023. ( Undist. ) .

Orobanchaceae

Castilleja integra A. Gray. Wholeleaf Indian Paintbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Grassy opening between Douglas fir forest and aspens and willows along the creek, with Achillea millefolium, Artemisia frigida, and Koeleria macrantha. Terrace above creek in Guy Gulch, southwest side of County Road 70, 1.19 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3026. 3 Jul 2023. ( Golden ) . .

Castilleja linariifolia Benth. Wyoming Indian Paintbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual/perennial unknown, to 50 cm., plants of dry places, growing out of Artemisia; Stem and leaf glabrous; Leaf, linear, proximal 60 mm. × 2 mm. wide, margins curled up, length reduced distally to 15 mm, occasionally 3- or 5-lobed; Inflorescence, simple hairy; Bracts, 3-lobed, <calyx; Calyx, 26 mm., divided 14/26 (54%) abaxially and undivided adaxially, lobes curved upward; Corolla curved out through abaxial calyx sinus, beak described as sparsely puberulent, but unable to see in this collection (Described form Coll. No. 439, 31 Jul 2004).

- Guy Gulch, Top of very steep slope above creek, 90 m. southwest of County Road 70, 1.09 km. (geodesic) northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3043. 3 Jul 2023. ( KHD ^‡ ) . .

Castilleja miniata Hook. Giant Red Indian Paintbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Small ridge between two smaller gulches, deep shade of a gulch tributary to Guy Gulch, 260 m. southwest of County Road 70, 1.60 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3037. 3 Jul 2023. ( Golden KHD ^‡ ) . .

Orobanche fasciculata Nutt. (Syn: Aphyllon fasciculatum (Nutt.) Torr. & A. Gray ) Clustered Broomrape. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Several plants between two Cercocarpus montanus, with a few Eriogonum umbellatum, no Artemisia sp. nearby. Southwest side of County Road 70 and the gulch, 635 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3184. 31 Jul 2023. ( Undist. ) .

Plantaginaceae

Collinsia parviflora Lindl. Maiden Blue-eyed Mary. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, With Juniperus scopulorum, Artemisia frigida, Eriogonum jamesii, and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 100 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2939.1 6 Jun 2023. ( Golden ) Tom Schweich, with John Vickery 3313. 6/23/2023. . .

Penstemon glaber Pursh var. alpinus (Torr.) A. Gray. Sawsepal Penstemon. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, On the edge of an old road through forest of aspen, spruce and ponderosa pine, with Oxytropis lambertii and Packera fendleri. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 71 m. east northeast of the line shack, 1.05 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3156. 26 Jul 2023. ( Undist. ) . .

Penstemon secundiflorus Benth. Sidebells Penstemon. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Open southwest-facing slope between Pinus ponderosa with Juniperus communis var. depressa, Potentilla fissa, and Rubus deliciosus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope 40 m. west northwest of the line shack, 1.15 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2999. 23 Jun 2023. ( Golden ) . .

Penstemon virens Pennell ex Rydb. Front Range Beardtongue. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Open rocky slope. Douglas Mountain Study Area, area along Guy Gulch, about 340 m. above the county road, north side of Jefferson County Road 70 and near western boundary, 17.9 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2950. 6 Jun 2023. ( Golden ) . .

Penstemon virgatus A. Gray var. asa-grayi (Crosswh.) Dorn. Upright Blue Beardtongue. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, On a small berm from some long-ago disturbance, with Oreocarya virgata. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 140 m. north northeast of the line shack, 1.04 km. west southwest of Mt. Tom, 13.9 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3171.1 26 Jul 2023. ( Undist. ) . .

Veronica americana (Raf.) Benth. American Speedwell. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Growing in water at bottom of gulch. Small forested gulch tributary to Guy Gulch, 282 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.4 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery and Cindy Trujillo 3086. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Veronica peregrina L. var. xalapensis (Kunth) H.St.John. (=Veronica peregrina L.) Neckweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Sunny steam bed, with Stellaria longipes and Montia chamissoi. Muddy stream bed of upper meadow accessed by way of Pyrenees Lane, 40 m. northeast of line shack, 13.8 km. (geodesic) northwest of the GNISlocation of Golden. Tom Schweich, with John Vicjery 3143. 26 Jul 2023. ( Undist. ) .

Polemoniaceae

Collomia linearis Nutt. Tiny Trumpet. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual; Stem simple, unbranched; Leaves linear, 20-25 mm; Calyx membrane 0, lobes growing with capsule, becoming papery with age; Corolla white, 6-9 mm (Described from Coll. No. 713, 19 Nov 2011).

- Guy Gulch, Beside sunny dry trail on the north side of the gulch. Small forested gulch tributary to Guy Gulch, 345 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.5 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3087. 12 Jul 2023. ( Undist. ) Tom Schweich, with Cindy Trujillo and John Vickery 3346. 7/12/2023. . .

Microsteris gracilis (Douglas ex Hook.) Greene. Slender Phlox. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Nose of small southeast plunging ridge, with Heterotheca villosa, Ribes cereum, and Cercocarpus montanus. Douglas Mountain Study Area, area along Guy Gulch, about 160 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2945. 6 Jun 2023. ( Golden KHD ^‡ ) Also collected here: Achillea millefolium, Artemisia frigida, Physaria montana, Cerastium arvense, and Boutelous gracilis. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope just a few meters north of the line shack, 1.12 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2994. 23 Jun 2023. ( Golden ) . .

Polemonium foliosissimum A. Gray. Towering Jacob's Ladder. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Limited material for collection. Deep shade of a small gulch tributary to Guy Gulch, 150 m. southwest of County Road 70, 1.21 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3034. 3 Jul 2023. ( KHD ^‡ ) Sunny spot, with grasses and small shrubs. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, in front of the line shack, 1.07 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3163. 26 Jul 2023. ( Undist. ) .

Polygonaceae

Eriogonum alatum Torrey in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers. 168, plate 8. 1853. (Syn: Pterogonum alatum (Torr.) Gross ) Winged Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with Cindy Trujillo and John Vickery 3347. 7/12/2023. Open, sunny, meadow with Solidago missouriensis and Elymus elymoides. Semelparous. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 73 m. north of the line shack, 1.07 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3165. 26 Jul 2023. ( Undist. ) collected seed Tom Schweich, with John Vickery 3395. 9/8/2023. . .

Eriogonum umbellatum Torr. var. ramulosum Reveal. Buffalo Bill's Sulphur Flower. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Outwash delta of small watercourse with smooth brome, snowberry, aspen, and water birch. This collection fits the description of var. ramulosum with the branched inflorescence and bracted branches, whereas other parts of same plant do not. Coll. No. 3078 made nearby was similarly ambiguous as to variety. Southwest side of County Road 70 and the gulch, 600 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden, and 12.7 km. northwest of Buffalo Bill's grave. Tom Schweich, with John Vickery 3177. 31 Jul 2023. ( Undist. ) . .

Eriogonum umbellatum Torr. var. umbellatum. Sulphur-Flower Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

Type collected “near the Rocky Mountains” by Edwin James, 1820. Described by Torrey in 1827.

- Guy Gulch, There are several inflorescences in this collection that have a single branch and several that have an extra whorl of bracts as in variety ramulosum, a variety local to the Front Range. Sunny mouth of a small gulch tributary to Guy Gulch, 130 m. southwest across County Road 70 from the Centennial Ranch house, 2.52 km. south of Mount Tom, 12.2 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3078. 12 Jul 2023. ( Undist. ) . .

Polygonum douglasii Greene. (Syn: Polygonum majus (Meisner) Piper ) Douglas Knotweed. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 35-40 cm., generally glabrous; Leaves, cauline, alternate, some sort of papery tissue at base of leaf that could be an ocrea, 20 mm. × 1 mm. wide, linear to narrowly lanceolate, adaxial sparsely pitted, margins revolute; Inflorescence, flowers borne singly in axils; Flowers, stipe-like base; Perianth, #5 (looked like 3 outer and 3 inner to me) 2.5 mm. × 1 mm. wide, outer, greenish with pink margins, inner, pink with green mid-vein; Stamens, #8 (I was able to count 6), 1.4 mm.; Filaments, winged below; Ovary, superior, 1 mm. × 0.6 mm. wide; Styles, #3, 0.3 mm.; Stigmas, 1 per style; Fruit, 2.5 mm., black. Described from Coll. No. 1718, 28 Jul 2017.

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, with: Dieteria bigelovii, Helianthus pumilis, Heterotheca villosa, Euphorbia brachycera, and Bromus lanatipes. Southwest side of County Road 70 and the gulch, 620 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3183.1 31 Jul 2023. Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch. Southwest side of County Road 70 and the gulch, 635 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3185. 31 Jul 2023. ( Undist. ) . .

Rheum � hybridum Murray. Rhubarb. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, eleven plants counted Tom Schweich, with Cindy Trujillo 3340. 7/12/2023. . .

Rumex acetosella L. (Syn: Acetosella vulgaris (K. Koch) Fourr. , R. angiocarpus Murb. ) Sheep Sorrel. CalPhotos. Jepson eFlora. SEINet Taxon.

Coll. No. 1841, 17 May 2018, characters observed: Perennial herb from woody rootstock, to 30 cm., dioecious (all plants in this collection staminate); Leaves, basal and cauline similar, ocrea, 7-10 mm., petiole 20 mm. + blade 12-24 mm. × 6 mm. wide, base hastate, lobes pointing outward, tip acuminate; Pedicels, 1-3 mm.; Flowers, bulbar-like base, described as stipe-like, but does not look stipe-like such as that seen in Eriogonum umbellatum; Pedicels, 1-3 mm.; Tepals, #6, 1.7 mm., reddish (Described from Coll. No. 1841, 17 May 2018).

- Guy Gulch, Open, sunny field with short grasses. Beside small creek entering Guy Gulch from the northeast, southwest side of County Road 70, 107 m. southwest of the ranch house, 15.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2958. 14 Jun 2023. ( Golden ) Tom Schweich, with John Vickery 3315. 6/23/2023. .

Primulaceae

Androsace septentrionalis L. (Syn: Androsace septentrionalis L. ssp. subumbellata (A. Nelson) G. T. Robbins ) Pygmyflower Rockjasmine. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Sunny spot, on shoulder of abandoned stream bar, with Rubus deliciosus and Bromus inermis. Along stream tributary to Guy Gulch about 90 m. north of County Road 70, near the western boundary of the study area, 17.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2952. 6 Jun 2023. ( Golden ) . .

Dodecatheon pulchellum (Raf.) Merr. (=Primula pauciflora (Durand) A. R. Mast & Reveal) Beautiful Shootingstar. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with John Vickery 3320. 6/23/2023. .

Ranunculaceae

Anemone multifida Poir. Pacific Anemone. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Open edge of Douglas fir forest. Small delta at mouth of gulch tributary to Guy Gulch, southwest side of County Road 70, 1.20 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3028.1 3 Jul 2023. ( Undist. ) . .

Aquilegia coerulea E. James. Colorado Blue Columbine. CalPhotos. Jepson eFlora. SEINet Taxon.

Collected by E. James, 1820, described 1823, holotype: NY.

- Guy Gulch, More seen farther up the gulch. Just inside the mouth of a small gulch tributary to Guy Gulch, southwest side of County Road 70, 1.19 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3030. 3 Jul 2023. ( Golden ) . .

Clematis grosseserrata (Rydb.) Ackerfield. (Syn: Atragene grosseserrata Rydb. in Bull. Torey Bot. Club 29: 156 (1902) , C. occidentalis (Hornem.) DC. var. grosseserrata (Rydb.) J. S. Pringle ) Western Blue Virgin's-Bower. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Shaded floor of the drainage, with Micranthes rhomboidea. Mouth of a small gulch tributary to Guy Gulch, southwest side of the creek and County Road 70, 530 m. south southeast of the ranch house, 15.5 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2968.1 14 Jun 2023. ( Golden ) Edge of Douglas fir forest near the creek in Guy Gulch, southwest side of County Road 70, 1.15 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3024. 3 Jul 2023. ( KHD ^‡ ) On a steep slope between two smaller gulches, deep shade of a small gulch tributary to Guy Gulch, 165 m. southwest of County Road 70, 1.21 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3035.1 3 Jul 2023. . .

Delphinium nuttallianum Pritz. Twolobe Larkspur. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Open northeast-facing slope. Southwest side of the creek and County Road 70, 503 m. south southeast of the ranch house, just north of a small gulch, 15.5 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2967. 14 Jun 2023. ( Golden ) . .

Ranunculus abortivus L. Littleleaf Buttercup. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Floor of gulch, also collected here: Circaea alpina, Prosartes trachycarpa, and Piptatherum micranthum. Small forested gulch tributary to Guy Gulch, 192 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery and Cindy Trujillo 3082. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Ranunculus glaberrimus Hook. var. ellipticus (Greene) Greene. Sagebrush Buttercup. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 11 cm., terrestrial; Stem, glabrous; Leaves, basal, petiole, 40 mm., blade, simple, 25 mm. × 13 mm. wide, elliptic to rhomboid, cauline, alternate, ternate, 24 mm. × 24 mm. wide; Flowers, actinomorphic; Sepals, 4.5 mm., lower surface few long soft white hairs; Petals, #5, 6 mm. × 4.5 mm. wide, bright yellow, not spurred; Achenes, in a globose cluster 5 mm. × 8 mm. wide, many in number, 1.5 mm. × 1.3 mm. wide, slightly hairy (Described from Coll. No. 2248 25 Apr 2020).

- Guy Gulch, Also collected here: Pseudocymopterus montanus. Edge of forest near the creek in Guy Gulch, southwest side of County Road 70, 1.14 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3022. 3 Jul 2023. ( Golden ) . .

Ranunculus repens L. Creeping Buttercup. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, terrestrial of wet habitat, not alpine, appressed to spreading hairy throughout; Leaves, basal, petiole to 26 cm., 8 cm. × 10 cm. wide, ternately compound, divided once again, then lobed, cauline, distributed along stem, alternate, compound; Flowers, radially symmetric, Sepals, spreading (not reflexed), 9 mm., long straight hairy; Petals, #5, 16 mm. × 12 mm. wide, yellow, not spurred, nectary scale free ≥½ length; Pistils many; Style absent; Achenes, (immature) 1.5 mm., beak straight to slightly curved (Described from Coll. No. 1333, 11 May 2016).

- Guy Gulch, Wet area from small creek entering Guy Gulch from the northeast, southwest side of County Road 70, 107 m. southwest of the ranch house, 15.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2957. 14 Jun 2023. ( Golden KHD ^‡ ) . .

Thalictrum fendleri Engelm. ex A. Gray. Fendler's Meadow Rue. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Deep shade of a small gulch tributary to Guy Gulch, 125 m. southwest of County Road 70, 1.19 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3032. 3 Jul 2023. ( Golden ) Shaded streamside, 185 m. west northwest across County Road 70 from the Centennial Ranch house, 2.35 km. south of Mount Tom, 12.4 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery and Cindy Trujillo 3077. 12 Jul 2023. ( Undist. ) .

Rhamnaceae

Ceanothus fendleri A. Gray. Fendler's Ceanothus. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Uncommon, amongst mountain mahogany scrubland. Slopes of Guy Gulch near Clear Creek. TRS: T3S R71W S34. R. J. Rondeau 9275. 23 Jun 1992. ( COLO00828202^‡ ) .

Rosaceae

Fragaria vesca L. Woodland Strawberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Stream terrace in open shade under Douglas fir. Southwest side of the creek and County Road 70, 220 m. southwest of the ranch house, 15.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2963. 14 Jun 2023. ( Golden KHD ^‡ ) . .

Geum macrophyllum Willd. var. perincisum (Rydb.) Raup. Large-leaf Avens. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Limited material, some eaten; with Hackellia floribunda Around the base of a willow in a former meander of the creek, 130 m. west across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3069. 12 Jul 2023. ( Undist. ) . .

Physocarpus monogynus (Torr.) J.M. Coult. (Syn: Spiraea monogyna Torr. ) Mountain Ninebark. CalPhotos. Jepson eFlora. SEINet Taxon.

Shrub, height unknown (growing in ravine); Leaves, alternate, simple, hairs stellate, petiole, 10 mm., blade, 30 mm. × 33 mm. wide, ovate, palmate-veined, doubly crenate; Inflorescence, umbellate corymb, ±20-flowered; Pedicels, 8-12 mm.; Flowers, limb, 12 mm., petals, 4.5 mm., color cream; Styles, 2 (Described from Coll. No. 1397, 8 June 2016).

- Guy Gulch, Common on slopes of side drainages. Guy Gulch near Clear Creek. TRS: T3S R71W S34. R.J. Rondeau 9281. 23 Jun 1992. ( COLO00828236^‡ ) On a steep slope between two smaller gulches, deep shade of a small gulch tributary to Guy Gulch, 165 m. southwest of County Road 70, 1.21 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3035. 3 Jul 2023. ( Golden ) . .

Potentilla fissa Nutt. ex Torr. & A.Gray. (=Drymocallis fissa (Nutt.) Rydb.) Bigflower Cinquefoil. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, herb, caespitose, to 20 cm., terrestrial, not stoloniferous, rhizomatous, glandular-hairy throughout; Stem, erect, green, multicellular viscid hairs; Leaves, basal, 58-125 mm. × 16-26 cm. wide, pinnately compound, leaflets, #11; cauline, #3-4 per stem, alternate, stipules, 5 mm. × 2 mm. wide, lanceolate, entire to once shallowly toothed; petiole, 18 mm., prior years remaining on plant (as sometimes described for P. rupincola), multicellular viscid hairs, leaflets, #7-13, 40-51 mm. × 20-22 mm. wide, petiolulate (not decurrent), 12 mm. × 9 mm. wide, viscid hairy, terminal leaflet (8)10 mm. side, margin, flat, serrate, teeth, 4-6 per side, on distal ¾, tip dark reddish; Inflorescence, congested cyme, with 5-7 flowers; Flowers, limb, 15 mm.; Calyx, lobes, #5, 7-11 mm. × 2.7-4.5 mm. wide, fused ±½, viscid hairy, epicalyx bractlets, 3-5 mm. × 0.8-1.3 mm. wide, ±½ sepals; Receptacle, hairy, <1 mm., Petals, 7-9 mm. × 5-9 mm. wide, obovate, color yellow; Stamens, >25; Anthers, 1.4 mm. × 1 mm. wide; Ovaries, many, superior, glabrous; Styles, widest at middle, or thickest at base, tapered from middle, attached laterally below top of ovary; Stigma, #1; Achenes, glabrous. (Described from Coll. No. 1364, 21 May 2016, and Coll. No. 1911, 31 May 2018).

- Guy Gulch, With Cercocarpus montanus and Ribes cereum. Douglas Mountain Study Area, area along Guy Gulch, north side of Jefferson County Road 70 and near western boundary, 17.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2936.2 6 Jun 2023. Open southwest-facing slope between Pinus ponderosa with Juniperus communis var. depressa, Penstemon secundiflorus, and Rubus deliciosus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope 40 m. west northwest of the line shack, 1.15 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2998. 23 Jun 2023. ( Golden ) . .

Potentilla norvegica L. Norwegian Cinquefoil. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 25 cm., erect, ±spreading stiff hairy throughout, 1.5 mm., glands, sparse, obscure; Leaves, cauline, stipules, large, 8 mm. × 4 mm. wide, lanceolate, petiole 19 mm. + blade 22 mm. × 24 mm. wide, ternately compound, leaflets, 3(4); Calyx, sepals, 3.5-4.0 mm. × 2 mm. wide, fused >½; Corolla, petals, free, yellow; 1.5 mm. × 1 mm. wide; Stamens, most seen, #8; Style, 0.7 mm., thickest at base; Achenes, 0.6 mm., tan, minutely papillate. Circumpolar. (Described from Coll. No. 1500, 13 July 2016).

- Guy Gulch, Beside stream near line shack, collected nearby: Rorippa palustris, Stellaria longipes ssp. longipes, and Veronica peregrina var. xalapensis. Circumpolar. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 30 m. north northeast of the line shack, 1.09 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3172. 26 Jul 2023. ( KHD00080569^‡ Undist. ) . .

Rosa acicularis Lindl. ssp. sayi (Schwein.) W. H. Lewis. (Syn: Rosa acicularis Lindl. , Rosa sayi Schweinitz ) Say's Acicular Rose. CalPhotos. Jepson eFlora. SEINet Taxon.

Prickles on new growth, leaflets 5-7(9), flowers 1-3

- Guy Gulch, Old tree blow-down with Acer glabrum and Symphoricarpos occidentalis and a colony of rhubarb nearby. Terrace below hill slope, 150 m. west northwest across County Road 70 from the Centennial Ranch house, 2.39 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3075. 12 Jul 2023. ( Undist. ) Around the base of a Douglas fir and Rocky Mountain maple. Terrace above creek in Guy Gulch, southwest side of County Road 70, 1.18 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3027. 3 Jul 2023. ( Golden KHD ^‡ ) . .

Rubus deliciosus Torr. (Syn: Oreobatus deliciosus Torr.(E. James ex Torr.) Rydb. ) Delicious raspberry. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial shrub, to 1.5 m.; Stem, bark, shreddy; Leaves, simple, 17 mm. × 23 mm. wide, palmate veined, lobed, serrate, few straight hairs, petiole, 11 mm.; Flowers, white, solitary, 17-19 mm.; Fruit, unknown (Described from Coll. No. 1091, 30 Apr 2015).

- Guy Gulch, Open slope, southeast aspect, with Juniperus communis var. depressa, Pinus ponderosa, and Potentilla fissa. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope 28 m. northwest of the line shack, 1.14 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2996. 23 Jun 2023. ( Golden ) .

Rubiaceae

Galium boreale L. (Syn: Galium septentrionale Roem. & Schult. ) Bedstraw. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 40 cm.; Stems, ascending; Leaves, in whorls of 4, tips rounded, 3-nerved; Flowers, cream-colored; Fruit, short-hairy (Described from Coll. No. 2374, 23 June 2020).

- Guy Gulch, Bank of stream with aspen, Douglas fir, and ponderosa pine, also collected here: Nassella viridula. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 260 m. north of the line shack, 1.11 km. west southwest of Mt. Tom, 13.9 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3169. 26 Jul 2023. ( Undist. ) . .

Galium triflorum Michx. Fragrant Bedstraw. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Very deep forest duff on a small shaded divide between two drainages. Small forested gulch tributary to Guy Gulch, 260 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.4 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3085. 12 Jul 2023. ( KHD ^‡ ) .

Salicaceae

Populus angustifolia E. James. Narrowleaf Cottonwood. CalPhotos. Jepson eFlora. SEINet Taxon.

Collected and described by Edwin James of the Long Expedition, 1820.

- Guy Gulch, Common, Along Guy Gulch near Clear Creek. TRS: T3S R69W S27. R. J. Rondeau 9277. 23 Jun 1992. ( COLO00828152^‡ ) . .

Salix � fragilis L. (Syn: Salix � rubens Schrank ) Crack Willow. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Along the creek in Guy Gulch, 115 m. southwest of the ranch house, 15.9 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2955. 14 Jun 2023. ( Golden KHD ^‡ ) . .

Salix bebbiana Sarg. Bebb Willow. CalPhotos. Jepson eFlora. SEINet Taxon.

Shrub, multi-stem, > 1 m.; Stems, not pruinose, current year reddish brown; Leaves, alternate, elliptic, 20 mm. × 9 mm. wide, petiole 2-3 mm., pubescent both sides; Catkins, pistillate, 35 mm., open, loosely flowered, floral bracts, tan, stipe, 3 mm.; Capsules, 6 mm., pubescent. (Described from Coll. No. 2959, 14 Jun 2023.)

- Guy Gulch, Bank of creek. Beside the creek of Guy Gulch, southwest side of County Road 70, 96 m. southwest of the ranch house, 2.48 km. south of Mt. Tom, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2959. 14 Jun 2023. ( Golden KHD ^‡ ) Bank of the creek in Guy Gulch, southwest side of County Road 70, 1.13 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3020. 3 Jul 2023. ( Golden ) . .

Salix boothii Dorn. Booth's Willow. CalPhotos. Jepson eFlora. SEINet Taxon.

Shrub erect; unclear as to clonal vs. non-clonal; Bud scales clearly fused; Petiole glandless; Leaves entire, blade 40 mm by 12-15 mm wide, glands on margins, few hairs on both surfaces, variably more dense on top than on bottom; Catkin bracts dark (obs: black). (Described from Coll. No. 484, 27 Nov 2011).

- Guy Gulch, On the bank of the creek in Guy Gulch, 155 m. south of the Centennial Ranch house, 2.56 km. south of Mt. Tom, 12.1 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2962. 14 Jun 2023. ( Golden KHD ^‡ ) . .

Salix lasiandra Benth. var. caudata (Nutt.) Sudw. Greenleaf Willow. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Along the creek in Guy Gulch, 95 m. southwest of the Centennial Ranch house, 2.48 km. south of Mt. Tom, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2956. 14 Jun 2023. ( Golden ) . .

Salix scouleriana Barratt ex Hook. Scouler's Willow. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Openings in forest, east-facing slope below top of ridge, bottom of rock outcrop, well above stream, with Ribes cereum, Jamesia americana, and Acer glabrum. Douglas Mountain Study Area, area along Guy Gulch, about 315 m. above the county road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2948. 6 Jun 2023. ( Golden KHD ^‡ ) .

Sapindaceae

Acer glabrum Torr. Rocky Mountain Maple. CalPhotos. Jepson eFlora. SEINet Taxon.

Described by Torrey (1827) from a collection by Edwin James of the Long Expedition (1820).

- Guy Gulch, Off the east side of a small ridge, also here, Collinsia parviflora on sunny ground around the maple. Douglas Mountain Study Area, area along Guy Gulch, about 100 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2939. 6 Jun 2023. ( Golden ) .

Saxifragaceae

Micranthes rhomboidea (Greene) Small. (Syn: Saxifraga rhomboidea Greene ) Diamondleaf Saxifrage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Mouth of a small gulch tributary to Guy Gulch, southwest side of the creek and County Road 70, 530 m. south southeast of the ranch house, 15.5 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2968. 14 Jun 2023. ( Golden KHD ^‡ ) .

Scrophulariaceae

Scrophularia lanceolata Pursh. Lanceleaf Figwort. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Around the base of a willow in a former meander of the creek, 115 m. west across County Road 70 from the Centennial Ranch house, 2.43 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3068. 12 Jul 2023. ( KHD ^‡ ) . .

Verbascum thapsus L. Common Mullein. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with John Vickery 3312. 6/23/2023. .

Violaceae

Viola canadensis L. (Syn: Viola rydbergii Greene , Viola scopulorum (A. Gray) Greene ) Canadian White Violet. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, In the shade on a stream terrace. Southwest side of the creek and County Road 70, 237 m. south of the ranch house, 15.7 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2964. 14 Jun 2023. ( Golden ) .

Alliaceae

Allium cernuum Roth. Nodding Onion. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, also collected here: Artemisia ludoviciana, Symphyotrichum porteri, Muhlenbergia montana, and Thinopyrum intermedium. Southwest side of County Road 70 and the gulch, 660 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3189. 31 Jul 2023. ( Undist. ) .

Cyperaceae

Carex aurea Nutt. Golden Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, In ponderosa pine duff beside creek. In the gulch about 75 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3215. 8 Sep 2023. ( KHD ^‡ ) . .

Carex inops L.H. Bailey ssp. heliophila (Mack.) Crins. (Syn: C. pensylvanica Lam. ssp. heliophila (Mack.) W. A. Weber ) Sun Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 16 cm., prior year leaves to 23 cm.; Rhizome, 5-10(12) cm.; Culm, 11.5 cm. × 0.6 mm., ±triangular, but obscured by white striations at least when dry; Leaves, 12 cm. × 1.5 mm., ±flat, some folded ≤30°.; Inflorescence, multiple spikes, all approximate, 1-2 pistillate spike(s) below, 1 staminate spike above; Bracts, lowest, blade 8 mm., sheath 4.5 mm., papery; Pistillate spike, peduncled 1.0-1.3 mm., 9 mm., brown (not black); Staminate spike, terminal, 12-16 mm., ovoid (not cylindric), brown (not black); Scales, >perigynum body; Perigynum, pubescent on faces, margin ciliate; Achenes, unknown. Described from Coll. No. 1079, 23 April 2015, and Coll. No. 1568, 3 Apr 2017.

- Guy Gulch, On the nose of a low ridge with Ribes cereum, and Artemisia frigida. Common. Douglas Mountain Study Area, area along Guy Gulch, about 47 m. above the road, north side of Jefferson County Road 70 and near western boundary, 17.6 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2937. 6 Jun 2023. ( Golden ) Growing on a small ranch road berm. Meadow north of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 20 m. southwest of the line shack, 1.13 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3007. 23 Jun 2023. ( Golden ) . .

Carex occidentalis L. H. Bailey. Western Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial sedge; Habit, caespitose; Culms, to 50 cm., slightly scabrous especially below the inflorescence; Leaves, 1.7 mm. wide, green, sheaths, white-hyaline, ventrally smooth; Inflorescence, 29 mm. × 10 mm. wide, loosely clustered; Spikes, identical appearing, 6 mm. × 5 mm. wide, terminal and lateral androgynous (there are no anthers, but the flowers at the top of each spike contain white filaments); Bracts, 5 mm., proximal, 10 mm., <inflorescence, leaf-like; Pistillate scales, 3.5 mm., <perigynia, mid-vein green, brown laterally, hyaline margin; Perigynia, #12 per spike, 4 mm. × 1.6-1.8(2) mm. wide, weakly winged, ±veinless, glabrous, beak, 1 mm., flattish, dorsally bulged and the margin is displaced but not onto the ventral face; Achene, 2.3 mm. × 1.5 mm. wide, biconvex, short oblong; Stigmas, #2; Anthers, n/a; (Described from Coll. No. 2056, 4 Jun 2019, but see also Coll. No. 1913.)

- Guy Gulch, With Acer glabrum, just below a rock outcrop Douglas Mountain Study Area, area along Guy Gulch, about 325 m. above the county road, north side of Jefferson County Road 70 and near western boundary, 17.85 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2949. 6 Jun 2023. ( Golden KHD ^‡ ) .

Juncaceae

Juncus arcticus (Willd.) Trautv. var. balticus (Willdenow) Trautvetter. (Syn: Juncus arcticus (Willd.) Trautv. ssp. ater (Rydb.) Hult�n , Juncus ater Rydb. , Juncus balticus Willd. , Juncus balticus Willd. ssp. ater (Rydb.) Snogerup , J. balticus Willd. var. montanus Engelm. ) Arctic Rush. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 1 m.; Leaves, basal sheaths only; Inflorescence, appears lateral; Bract, appearing to be extension of stem, 14-18 cm., >stem; Flowers, many per stem, (obs. 20); Stamens, 5. Described from Coll. No. 1269, 29 Jul 2015.

- Guy Gulch, Abandoned stream terrace, southwest side of County Road 70, 1.13 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3018. 3 Jul 2023. ( Golden ) .

Liliaceae

Calochortus gunnisonii S. Watson. Gunnison's Mariposa Lily. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Small patch at the end of an old road. Sunny opening in forest of aspen, spruce, and ponderosa pine. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 110 m. southeast of the line shack, 1.05 km. west southwest of Mt. Tom, 13.65 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3161. 26 Jul 2023. ( Undist. ) . .

Prosartes trachycarpa S. Watson. (Syn: Disporum trachycarpum (S. Watson) Benth. & Hook. f. ) Roughfruit Fairybells. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, On the bank of the gulch, also collected here: Circaea alpina, Ranunculus abortivus, and Piptatherum micranthum. Small forested gulch tributary to Guy Gulch, 192 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with John Vickery and Cindy Trujillo 3083. 12 Jul 2023. ( KHD ^‡ Undist. ) .

Orchidaceae

Platanthera (L.) Rich. Fringed Orchid. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, several streamside Tom Schweich, with Cindy Trujillo 3341. 7/12/2023. .

Poaceae

. Grass Family. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, steep slope, almost a wall On a steep slope between two smaller gulches, deep shade of a small gulch tributary to Guy Gulch, 170 m. southwest of County Road 70, 1.21 km. northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3036. 3 Jul 2023. ( Golden ) . .

Agropyron cristatum (L.) Gaertn. Crested Wheat Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Dry former roadside in the shaded mouth of a small gulch tributary to Guy Gulch, 192 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3080. 12 Jul 2023. ( KHD ^‡ ) . .

Agrostis gigantea Roth. (Syn: Agrostis alba L. ) Redtop. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 95 cm., rhizomatous; Roots, fibrous; Stem, herbaceous; Leaves, blade and sheath differentiated, sheath, 80 mm., open, glabrous, ligule, membranous, 4 mm., auricles, absent, blade, 70 mm. × 2 mm. wide, flat, scabrous; Inflorescence, 1 per culm, >leaves, panicle, 15 cm. × 4 cm. wide, 5-7 branches; Rachis, not extended, sparsely scabrous; Spikelets, many, 2.3 mm. × 0.7 mm. wide, similar, borne singly, pedicels, 0.7-2.0 mm., 1-flowered; Compression, unremarkable; Disarticulation, above the glumes; Glumes, lower, 1.8 mm., veins, #1, sparsely scabrous, upper, 1.8 mm., >lowest floret, veins, #3, obscure, ±parallel; Lemma, 1.7 mm., <glumes, membranous, veins, ≤3; Palea, 1.0 mm., <lemma; Anthers, #3, 1.2 mm. (Described from Coll. No. 1980, 13 July 2018.)

- Guy Gulch, Shaded streamside 35 m. behind and northeast of the Centennial Ranch house, 12.2 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3211. 8 Sep 2023. ( KHD ^‡ ) . .

Bouteloua gracilis (Kunth) Lag. ex Griffiths. (Syn: Chondrosum gracile Kunth ) Blue Grama. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 40 m. northeast of the line shack, 1.08 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3146. 26 Jul 2023. ( Undist. ) Tom Schweich, with John Vickery 3311. 6/23/2023. . .

Bromus lanatipes (Shear) Rydb. (Syn: Bromopsis lanatipes (Shear) Holub ) Wooly Brome. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass (short-lived?), 50 cm., clumped; Roots, fibrous; Stem, herbaceous; Internodes, glabrous; Leaves, blade and sheath differentiated, soft; Sheath, 60-70 mm., closed, long shaggy hair; Ligule, 1.5 mm., membraneous, auricles, absent; Blade, 160 mm. × 5 mm. wide, adaxial scaberulous, tip, acute; Inflorescence, 1 per culm, >leaves, panicle, 130 mm. × 60 mm. wide, 2+ branches; Rachis, not extended, scabrous; Spikelets, #12-13, 23 mm. × 5 mm. wide, similar, borne singly; Compression, lateral; Disarticulation, unknown, should be above the glumes; Glumes, lower, 5 mm., veins, #1, keeled, keel scabrous, upper, 6 mm., <lowest floret, veins, #5, keeled; Lemma, 7.5 mm., >glumes, hairy laterally becoming more broadly hairy distally, veins, #5, convergent, awns, #1, 3 mm., straight, barbellate, attached near end; Palea, 9 mm., ±=lemma, membraneous, keel ciliate, veins, lt. green, margin, glabrous, tip, entire; Anthers, #3, 2.3 mm., yellow; Achene, immature (Described from Coll. No. 2170, 21 July 2019).

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, with: Dieteria bigelovii, Helianthus pumilis, and Heterotheca villosa. Southwest side of County Road 70 and the gulch, 615 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3181. 31 Jul 2023. ( KHD ^‡ Undist. ) . .

Calamagrostis purpurascens R. Br. Purple Reedgrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 40 cm., no rhizomes seen; Leaves, sheath, 12 cm., open, ligule, membranous, 4 mm., auricles, 0, blade, 15 cm. × 3 mm. wide, flat, scabrous, also adaxially densely and minutely hairy between the ribs; Inflorescence, <leaves, 1 per culm, panicle, 110 mm. × 12 mm. wide; Rachis, not extended; Spikelets, many, 8 mm. × 1 mm. wide, similar; Glumes, lower, 6 mm., veins, 1, upper, 5 mm., > lowest floret, veins, 1 (3?), keeled, awns, 0; Florets, 1^* per spikelet; ^*Rachilla, extended beyond upper floret as though there could be another floret up there, hairy; Callus, short straight white hairs; Lemma, 4 mm., < glumes, green, veins, 5, glabrous, tip, toothed, awns, 1, 7 mm., bent, attached, near base of lemma; Palea, 4 mm., < lemma, membranous; Achene, 1.7 mm., green. (Described from Coll. No. 3041, 3 July 2023.)

- Guy Gulch, Gentle north-facing slope in Douglas fir forest with little to no middlestory. Beside well-established game trail in open shade on a forested hillside above Guy Gulch, 290 m. southwest of County Road 70, 1.15 km. (geodesic) northwest of Centennial Ranch house, 13.4 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3041. 3 Jul 2023. ( KHD ^‡ ) . .

Dactylis glomerata L. Orchard Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 1.0-1.2 m., not rhizomatous, basal or subterranean internodes not swollen; Stem herbaceous; Leaf, Sheath open and closed observed, published descriptions are roughly equally divided as to whether the sheath is open or closed, Ligule membraneous, 5 mm.; Blade, differentiated from sheath, base not constricted, soft, 25 cm. × 0.7 cm. wide, not sharp-pointed; Auricle, rounded, <1 mm., generally described as 0; Infloresence exceeding leaves, 13 cm., panicle, well developed, erect, 1° branches open, branching 4� or 5�; Spikelets not enclosed in a bur-like involucre, not subtended by bristles or long silky hairs, similar throughout plant, all on one side of rachis, crowded in dense clusters, on 2°-4° panicle branches ~~1 per node,~~ axis few hairy, some spikelets appear to be infertile; Glumes, 2 < lowest floret, lower, 3.5 mm, smaller and thinner than upper, 6 mm., keeled, glabrous to ciliate on keel, else sparsely hairy; Florets not modified into bulblets 4+ per spikelet , have feathery stigma-like material but no ovary (immature?), uppermost vestigal floret not club-shaped rudiment (as seen in Melica); Lemma lowest largest, 5 mm., reduced above, keeled, line of hairs on keel, 5 veins, tip forked, awn 1.0-1.5 mm.; Palea light green with 2 veins forked at tip. Described from Collection No. 815, 9 May 2012, Alameda County, CA and Coll. No. 1111, 26 May 2015, Jefferson County, CO.

- Guy Gulch, Tom Schweich, with John Vickery 3354. 7/26/2023. . .

Danthonia parryi Scribn. Parry's Oatgrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Elymus elymoides (Raf.) Swezey. (Syn: E. longifolius (J. G. Sm.) Gould , Sitanion hystrix (Nutt.) J. G. Sm. ) Squirreltail Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass to 50 cm., clumped; Inflorescence, bilateral spike; Rachis, internodes, 6.4 mm., breaking apart when mature; Spikelets, 2 per node; Glumes, #2, subulate, 62-65 mm.; Florets, #3, lowest 2 fertile, upper sterile; Lemma, 10 mm. + awn 50 mm., veins, #5, converging; Palea, 9 mm., 1 of 2 veins slightly extended as bristle. Variety brevifolius if infraspecific names are to be applied. Described from Coll. No. 1717, 28 July 2017.

- Guy Gulch, Open, sunny, meadow with Solidago missouriensis and Eriogonum alatum. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 73 m. north of the line shack, 1.07 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3166. 26 Jul 2023. ( KHD ^‡ Undist. ) . .

Hesperostipa comata (Trin. & Rupr.) Barkworth. (Syn: Stipa comata Trin. & Rupr. ) Needle and Thread. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, 50 cm., clumped, nonrhizomatous; Roots, fibrous; Stem, herbaceous; Leaves, blade and sheath differentiated; Sheath, 100-120 mm., open ≥½, glabrous; Ligule, membranous, length 3.7 mm., lacerate into 2 equal parts, auricles 0; Blade, 60 mm., involute, glabrous; Inflorescence, 1 per culm, >leaves, panicle, 200 mm. × 30 mm. wide; Rachis, not extended, somewhat scabrous throughout; Spikelets, many, similar, borne singly; Compression, unremarkable; Disarticulation, above the glumes; Glumes, lower, 23-34 mm., veins #3, upper, 23-29 mm., veins #5, awl-shaped, rounded, membranous, ±equal, tip, very narrow, not awned; Florets, 1 per spikelet; Callus, 4.5-50 mm., sharp, straight hairs 1.0-1.5 mm., color tan; Lemma, 9.5-10.0 mm., rolled, indurate, straight hairy 0.5 mm., color white-tan, veins #3(?), awns, #1, 125-160 mm., twisted and short straight hairy proximal 45 mm., bent, scabrous distally; Palea, 9 mm., ±lemma, few white hairs on mid-vein; Stamens, #3; Anthers, 6.5 mm. (Described from Coll. No. 1890, 28 May 2018).

- Guy Gulch, Sunny meadow, also collected here: Oenothera villosa, Veronica peregrina var. xalapensis, and Bouteloua gracilis. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, meadow 45 m. northeast of the line shack, 1.08 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3149. 26 Jul 2023. ( Undist. ) . .

Koeleria macrantha (Ledeb.) Schult. Prairie Junegrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial bunch grass, to 45-55 cm., non-rhizomatous; Leaves, mostly basal or lowest cauline, cauline, sheath, 90 mm., open, ligule, <1-1.5 mm., membraneous, auricles, 0, blade, 40 mm., tip prow-shaped or merely constricted; Inflorescence, panicle, 60 mm. × 9 mm., shiny in anthesis due to exposure of translucent palae, short branches, branches short soft hairy; Spikelets, 5 mm., 1 per node on 1°-3° or indistinct panicle branches; Glumes, lower, 3 mm., veins 1, upper, 4 mm., veins 3; Florets, 3, #1 and #2 pistillate, #3 staminate, or variously mixed bisexual and pistillate, open, i.e., palea separated from lemma; Disarticulation, between florets; Rachilla hairy, extends nearly 1 mm. above upper floret (or not); extension undecorated; Lemma, 4.5 mm., veins 5, short hairy throughout, awn, 0-0.5 mm., short, soft; Palea, =lemma, translucent or colorless, exposed, i.e., outside lemma.; Stamens, 3, 1.8 mm. Described from Coll. No. 1131, 9 June 2015, and Coll. No. 1144, 15 Jun 2015.

- Guy Gulch, In the middle of an old road through forest of aspen, spruce and ponderosa pine, with Packera fendleri, Sedum lanceolatum, Oxytropis lambertii, and Penstemon glaber var. alpinus. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 70 m. east northeast of the line shack, 1.04 km. west southwest of Mt. Tom, 13.7 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3158. 26 Jul 2023. ( Undist. ) . .

Muhlenbergia montana (Nutt.) Hitchc. Mountain Muhly. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 50 cm., caespitose; Leaves, sheath, open, ligule, membraneous, 4.5 mm., auricles, 0, blade, 110 mm. × 1 mm. wide; Inflorescence, rather sparse contracted panicle, 120 mm.; Florets per spikelet, #1; Glumes, #2, papery, toothed, lower, 1.5 mm., upper, 2 mm., teeth 3; Lemma, 3 mm. + awn 13 mm., flexuous, tuft of hairs at base; Palea, 2.8 mm. Described from Coll. No. 1282, 28 Aug 2015.

Nassella viridula (Trin.) Barkworth. (Syn: Stipa viridula Trin. ) Green Needlegrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, 70-100 cm., clumped, non-rhizomatous; Stem, herbaceous; Leaves, cauline, sheath, 17 mm., ligule, 3 mm., membraneous, collar with few hairs at sides, blade, to 30 cm., convolute; Inflorescence, 1 per culm, panicle, 20-25 cm.; Rachis, lightly scabrous, not extended beyond upper spikelet; Compression, unremarkable; Spikelets, 1 per node; Florets, 1 per spikelet, bisexual; Glumes, 2, 8-9 mm., ±equal, rounded, membraneous, colorless, exc. 3 green veins, tip, short (2 mm.) hair-like awn; Disarticulation, above the glumes, Florets, 1 per spikelet; Callus, short; Lemma, 5-6 mm. × 1.2 mm. wide, <glumes, green, hairy, <1 mm., indurate, enclosing grain, awns, #1, 20-25 mm., twisted, bent, short hairy (±0.2 mm.); Palea, 1.5-2.0 mm., <lemma, membraneous, glabrous; Stamens, #3. Described from Colls. No. 1146, 1652, and 1698.

- Guy Gulch, Bank of stream with aspen, Douglas fir, and ponderosa pine, also collected here: Galium boreale. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, 260 m. north of the line shack, 1.11 km. west southwest of Mt. Tom, 13.9 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3170. 26 Jul 2023. ( Undist. ) . .

Phalaris arundinacea L. Reed Canarygrass. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Also nearby in still water: Montia chamissoi. In still water beside the creek, 94 m. west across County Road 70 from the Centennial Ranch house, 2.42 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3074. 12 Jul 2023. ( KHD ^‡ Undist. ) . .

Phleum pratense L. Timothy. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Tom Schweich, with John Vickery 3355. 7/26/2023. . .

Piptatherum micranthum (Trin. & Rupr.) Barkworth. Littleseed Ricegrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 50 cm., caespitose; Leaves, sheath, 75 mm., open, ligule, membranous, 1.5 mm., blade, 250 mm. × 3.2 mm. wide, some flat, some involute; Inflorescence, 1 per culm, <leaves, panicle, contracted [more so than would be expected], 120 mm. × 5 mm. wide; Rachis, not extended; Compression, not remarkable; Glumes, lower, 3.2 mm., veins, 5(7?), upper, 3.5 mm. >lowest floret, veins, 5(7?), membranous to transparent distally, awns, 0; Florets, 1 per spikelet; Lemma, 2.2 mm., <glumes, coriaceous, rolled, sparsely pubescent, veins, 3, awns, #1, 9 mm., wavy, deciduous; Palea, 2 mm., <lemma, coriaceous. (Described from Coll. No. 3079, 12 July 2023.)

- Guy Gulch, Dry former roadside in the shaded mouth of a small gulch tributary to Guy Gulch, 190 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo and John Vickery 3079. 12 Jul 2023. ( KHD ^‡ ) . .

Poa pratensis L. (Syn: P. agassizensis B. Boivin & D. L�ve ) Kentucky Bluegrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 40-75 cm.; Roots fibrous; Rhizomes slender, light-colored, 0.8-1.0 mm. dia., to 12 cm.; Culm, not bulbous at base, not strongly flattened; Nodes; Leaf blades and sheath differentiated, soft, Sheath, 85-130 mm., open at least ½; Auricles 0; Ligules membraneous, ≤1 to 1.8 mm.; Blade, lower involute or folded, upper flat, 25-75 mm. × 3 mm. wide, margin, scabrous, tip ±prow-shaped (or not); Inflorescence 1 per culm, terminal, panicle, 70-130 mm. × 33-65 mm. wide, pyramidal, branches scabrous; Rachis, not extended, glabrous; Spikelets, 4-5 mm. × 2.5 mm. wide, similar throughout plant, singly pedicelled on 2°-5° branches, pedicels 0.5-2.0 mm., with both pistillate and staminate florets; Compression lateral; Disarticulation above the glumes; Glumes, keeled, keels, glabrous, scabrous, or with small line of stiff hairs distally, lower, 2.0-2.8 mm., <lowest lemma, veins 1 or 3, upper, 2.5-3.0 mm., veins 3; Florets, #(2)3-4 per spikelet (eliminates Agrostis), mostly bisexual; Rachilla, extends 1 mm. above upper floret, not hairy; Callus long cobwebby hairs (distinctive!), or with some cobwebby hairs, but cobwebby hairs also elsewhere; Lemma 2.7-3.0 mm., >glumes, glabrous, veins 3-5, likely 5 as the 2 outer veins that are visible are quite near margins, short hairy on keel and margins cobwebby proximally, margins scarious, tip broadly acute, Awns 0; Palea 2.3-3 mm., ≤lemma, membraneous, green, esp. on veins, keel scabrous, intercostal regions narrow and glabrous; Anthers #3, 1-1.6 mm., purple (streaked); Stigma feathery, white. Described from Coll. Nos. 470 & 860, Mono County, CA, and Coll. Nos. 1118, 1420 & 1889, 2057, Jefferson County, CO. Subspecies of P. pratensis are not recognized in Colorado (Weber&Wittmann 2012, Ackerman 2015).

- Guy Gulch, On a small southeast-facing ridge, with Artemisia dracunculus, Sedum lanceolatum, and Eriogonum jamesii. Douglas Mountain Study Area, area along Guy Gulch, about 220 m. above the county road, north side of Jefferson County Road 70 and near western boundary, 17.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 2946. 6 Jun 2023. ( Golden ) Sunny spot on a slope just above an abandoned stream terrace, southwest side of County Road 70, 1.13 km. northwest of Centennial Ranch house, 13.3 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3019. 3 Jul 2023. ( KHD ^‡ ) . .

Thinopyrum intermedium (Host) Barkworth & D.R. Dewey. (Syn: Elytrigia intermedia (Host) Nevski , Elymus hispidus (Opiz) Melderis ) Intermediate Wheatgrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to >1 m., rhizomatous; Leaves, sheath, open, 19 cm., outer margin ciliate proximally, ligules, membraneous, 1 mm., auricles, 0, blade, 24 cm., involute; Inflorescence, 2-sided spike; Spikelets, 1 per node, sessile, ascending; Glumes, ±equal, 7.5-8.0 mm., stiff, veins 5, tip offset mucronate, awn 0, sparsely hairy on veins and margins; Florets per spikelet, 6; Lemma, 9 mm., stiff, veins 5, tip rudimentary awn; Palea, 8.5 mm., robust, fused to grain. Described from Coll. No. 1272, 20 July 2015.

- Guy Gulch, Sunny southeast-facing rocky slope, north ridge above small gulch tributary to Guy Gulch, also collected here: Artemisia ludoviciana, Symphyotrichum porteri, Allium cernuum and Muhlenbergia montana. Southwest side of County Road 70 and the gulch, 660 m. northwest of Centennial Ranch, 12.8 km. northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3188. 31 Jul 2023. ( Undist. ) .

Ruscaceae

Maianthemum racemosum (L.) Link ssp. amplexicaule (Nutt.) LaFrankie. (Syn: Maianthemum amplexicaule (Nutt.) W. A. Weber ) Feathery False Lily of the Valley. CalPhotos. Jepson eFlora. SEINet Taxon.

Maianthemum stellatum (L.) Link. (Syn: Smilacina stellata (L.) Desf. ) Starry False Lily of the Valley. CalPhotos. Jepson eFlora. SEINet Taxon.

- Guy Gulch, Under Douglas fir on upper bank of creek with Mertensia lanceolata. North of Guy Gulch, accessed by a ranch road off of Pyrenees Lane, on the southwest-facing slope 80 m. south of the line shack, 1.16 km. west southwest of Mt. Tom, 13.8 km. (geodesic) northwest of the GNIS location of Golden. Tom Schweich, with John Vickery 3000. 23 Jun 2023. ( Golden ) .

Total number of taxa:	167
Native Taxa: (serif, italic, bold)	145
Exotic Taxa: (sans-serif, italic)	19
Nativity Undetermined: (default font, italic)	3
Listed Weeds: Identified as Weed	2

Notes:

† -- Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
‡ -- Southwest Environmental Information Network, SEINet. 2009-2014. http//:swbiodiversity.org/seinet/index.php. Accessed from July 2009 to September 2014.

Locations Included in This Area

Douglas Mountain.

Guy Gulch.

Bibliography

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Date and time this article was prepared: 11/3/2024 7:02:49 PM.