|
Detailed Area Plant List for Tucker and Cressman Gulch Open Space, 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 Tucker and Cressman Gulch Open Space, Jefferson County, United States.
 Coll. No. 1691, Pascopyrum smithii |
 Coll. No. 3098, |
 Inflorescence of Coll. No. 1691, Pascopyrum smithii |
Pinaceae
Pinus edulis Engelm. Pinyon Pine. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
horticultural
4571.
4/15/2026.
.
.
 Coll. No. 3547, Pinus edulis. |
 Coll. No. 3547, Pinus edulis. |
 Location of Pinus edulis on Mt. Zion. |
Pinus scopulorum Lemmon. (Syn: P. ponderosa Laws. var. scopulorum Engelm. ) Rocky Mountain yellow pine. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4541.
4/15/2026.
.
 East slope of Tarryall Mountains from Camp Site 8. |
 Coll. No. 1316, Pinus |
 Rocky Mountain yellow pine on top of North Table Mountain. |
Anacardiaceae
Rhus glabra L. Smooth Sumac. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Tom Schweich 2908.
7/6/2022.
.
.
 Last year's fruit on Rhus glabra |
 Coll. No. 2556, Rhus glabra. |
Rhus trilobata Nutt. var. trilobata. (Syn: Rhus aromatica Aiton var. trilobata (Nutt.) A. Gray ex S. Watson ) Skunkbush Sumac. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4581.
4/15/2026.
.
Apocynaceae
Vinca minor L. Lesser Periwinkle. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4546. 4/15/2026. .
Asclepiadaceae
Asclepias speciosa Torr. Showy Milkweed. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Tom Schweich 2903.
7/6/2022.
.
 Seed pod of Asclepias speciosa |
 Seed of Asclepias speciosa |
Asteraceae
Artemisia ludoviciana Nutt. Silver Wormwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4579.
4/15/2026.
.
.
 Something is parasitizing my Artemisia |
 Coll. No. 1281, Artemisia ludoviciana |
 Entire leaves of Coll. No. 1281, Artemisia ludoviciana |
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).
- Cressmans Gulch, 4549. 4/15/2026. .
- Tucker Gulch (lower),
Tom Schweich 2906.
7/6/2022.
.
.
 Coll. No. 1200, Cirsium arvense |
 Coll. No. 3210, Cirsium arvense. |
 Coll. No. 1512, Cirsium arvense |
 Coll. No. 2773, Cirsium arvense |
Ericameria nauseosa (Pall. ex Pursh) G.L.Nesom & G.I.Baird var. graveolens (Nutt.) Reveal & Schuyler. (Syn: E. n. (Pall. ex Pursh) G.L.Nesom & G.I.Baird var. glabrata (Gray) G.L. Nesom & Baird ) Goldy-Locks. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4568.
4/15/2026.
4578.
4/15/2026.
.
.
Erigeron tracyi Greene. (Syn: E. cinereus A. Gray , E. colomexicanus A. Nelson , E. divergens Torrey & A. Gray var. cinereus A. Gray ) Running Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, 20-25 cm., caudex simple (not stout) non-rhizomatous, hairy throughout, with hairs 0.2-0.4 mm. spreading in all directions, glandular at high magnification; Stem, some with prior year's branches assumed to have been stoloniferous; Leaves, basal and cauline, basal, petiole, to 26 mm. + blade oblanceolate 8-12-20 mm. × 2-4-5.5 mm. wide, short hairy and glandular (especially visible at high magnification), margin entire, tip acute, some withered at flowering time, cauline, ±sessile, reduced or not well-developed above, but up to 32 mm. × 1.8 mm. wide; Peduncle, spreading to descending multicellular hairs with clear crosswalls, slightly pustular (maybe) or glandular at high magnification; Phyllaries, in 2+ ±equal series, but not distinctly imbricate, 3-4.5 mm. × 0.7 mm. wide, lanceolate, green center, light margins, spreading hairy; Receptacle epaleate; Flowers, 2 kinds; Ray flowers, cypsela 0.5 mm. + tube 2 mm. + ligule 4 mm. × 0.3-0.6 mm. wide = 6.5-7 mm. × 0.8 mm. wide, fertile, tip rounded, white & pink fading purple; Disk flowers, yellow; Pappus, ray and disk alike, inner, few capillary bristles, 4 mm., outer, short crown of scales, double pappus not particularly disgnostic in Erigeron. The most common form of E. tracyi is perhaps (speculative) a stabilized, apomictic hybrid between E. flagellaris and E. divergens (FNANM). Described from Coll. No. 1133, 9 Jun 2015 and Coll. No. 1337, 11 May 2016.
- Tucker Gulch (lower),
Tom Schweich 2904.
7/6/2022.
.
.
Heterotheca villosa (Pursh) Shinners. (Syn: H. v. (Pursh) Shinners var. nana (A. Gray) Semple , H. v. (Pursh) Shinners var. villosa ) Hairy False Goldenaster. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm.; Leaves, cauline alternate, entire, 1-veined, distal perpendicular to stems, hairs > glands; Heads solitary, with both ray and disk flowers; Phyllaries in 2+ series, unequal, to 7 mm.; Rays, 9 mm.; Pappus double, outer narrow scales ≤ 1 mm. (easier to see on mature fruit), inner bristles, 6.5 mm., white; Fruit, disk 3 mm., hairy.
- Tucker Gulch (lower),
Common within the city limits of Golden, along the creek of Tucker Gulch and the Tucker Gulch Trail, about 250 m. north of the First Street Bridge, and 350 m. south southwest of Ford Street.
Tom Schweich 1055.
10 Aug 2014.
(
CAS
UC2045980‡
UCR266872‡
)
.
.
Tanacetum parthenium (L.) Sch.Bip. Feverfew. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
In an opening between trees lining the south side of the creek: Populus deltoides ssp. monilifera, Acer negundo, and Ulmus pumilus.
EDDMapS Record ID 13517275.
Right bank of Tucker Gulch in Norman D. Park, just upstream of North Ford Street,1.92 km. north northwest of the GNIS location of Golden.
Tom Schweich 3445.
7 Jul 2025.
(
COLO
CS
JCOS s.n.
KHD
)
.
.
 Coll. No. 3445, Tanacetum parthenium. |
 Coll. No. 3445, Tanacetum parthenium. |
Thelesperma megapotamicum (Spreng.) Kuntze. Hopi Tea Greenthread. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 55 cm., woody at base, glabrous, eglandular; Leaves, opposite, pinnately lobed, lobes filiform, 30-35 mm.; Inflorescence, 1-3 heads per stem on 10 cm. peduncles; Phyllaries, 2 dimorphic series, without bristles or spines, outer, 2 mm. × 1.3 mm. wide, spreading, inner, 8 mm. × 3 mm. wide, connate 4.7 mm, tips erect; Receptacle, paleate, flat; Paleae, 7 mm. × 2 mm. wide, mid-vein greenish-brown, otherwise chartaceous; Flowers of 1 kind; Disc flowers, corolla, tube 3 mm. + throat 1 mm. + lobes 2 mm., color yellow with red-brown veins; Pappus, 2 retrorsely barbed awns; Cypsela, 3.8 mm. (Described from Coll. No. 1483, 6 Jul 2016.)
- Cressmans Gulch,
Tom Schweich 1947.
6/12/2020.
.
 Tea made from Thelesperma megapotamicum |
 Coll. No. 1707, Thelesperma megapotamicum |
 Coll. No. 1483, Thelesperma megapotamicum |
Berberidaceae
Berberis aquifolium Pursh. Holly-leaf Oregon-Grape. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4561. 4/15/2026. .
Boraginaceae
Asperugo procumbens L. German Madwort. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4544. 4/15/2026. Acer nedgundo, Galium aparine Tom Schweich 3556. 15 Apr 2026. ( Undist. ) .
- Tucker Gulch (lower), Also collected nearby: Lithospermum arvense, Alliaria petiolata, Lunaria annua, Veronica biloba, and Fumaria vaillantii. At the south end of a bridge over the gulch, on a bank above creek, extending from the edge of the concrete trail nearly down to the creek. Along the City of Golden Tucker Gulch Trail, about mid-way between 1st Street and 7th Place, 1.36 km. north northwest of the GNIS location of Golden. Tom Schweich, with Cindy Trujillo 2483. 27 May 2021. ( COLO2706091‡ KHD00075600‡ OBI185096‡ ) . .
Lappula occidentalis (S. Watson) Greene. (Syn: L. occidentalis (S. Watson) Greene var. occidentalis , L. redowskii (Hornem.) Greene , L. redowskii (Hornem.) Greene var. redowskii ) Flatspine Stickseed. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower), Tom Schweich 1839. 5/12/2020. . .
Lithospermum arvense L. (Syn: Buglossoides arvensis (L.) I. M. Johnst. ) Corn Gromwell. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, to 30 cm., hairs appressed with pustular bases; Stem, some branched distally; Leaves, basal and cauline, basal, petiole 5 mm. + blade 13 mm. × 3.5 mm. wide, slightly obovate, margin entire, hairs as above, withering, cauline, alternate, sessile, 19 mm. × 3.7 mm. wide, margin entire, hairs as above; Calyx, lobes, 5.2 mm. × 0.7 mm. wide, enlarged in fruit to 7 mm., hairs as above; Corolla, tube 4 mm. + throat 1 mm. + lobes 1.5 mm., blue to white, abaxial spreading hairy; Stamens, attached in tube; Style, 1.2 mm., Nutlets, #(1-2) 3 (4), 2.8 mm. × 2 mm. wide, green - tan, tuberculed (Described from Coll. No. 1783 and Coll. No. 1827).
- Cressmans Gulch, Alyssum simplex Tom Schweich 3558. 15 Apr 2026. ( Undist. ) .
- Tucker Gulch (lower),
Scattered in grasses under trees, also collected here: Asperugo procumbens, Alliaria petiolata, Lunaria annua, and Veronica biloba.
Along the City of Golden Tucker Gulch Trail between 1st Street and 7th Place, 1.45 km. north northwest of the GNIS location of Golden.
Tom Schweich 2478.
27 May 2021.
(
Golden
)
.
 Habitat of Coll. No. 1788, Lithospermum arvense. |
 Habitat of Lithospermum arvense in Kinney Run. |
 Habitat of Coll. No. 1827, Lithospermum arvense |
 Coll. No. 1788, Lithospermum arvense |
Brassicaceae
Alliaria petiolata (M. Bieb.) Cavara & Grande. Garlic Mustard. Weed: CO DofA, List: Watch. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Also collected nearby: Lithospermum arvense, Lunaria annua, Fumaria vaillantii, and Veronica biloba.
Colorado Noxious Weed Watch List.
On east bank of Tucker Gulch near the City of Golden Tucker Gulch Trail between 1st Street and 7th Place, 1.49 km. north northwest of the GNIS location of Golden.
Tom Schweich, with Cindy Trujillo 2481.
27 May 2021.
(
COLO2706604‡
KHD00075602‡
OBI185095‡
)
.
.
 Coll. No. 2481, Alliaria petiolata |
Berteroa incana (L.) DC. Hoary Alyssum. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual terrestrial herb, to 50 cm.; Leaves, cauline, elliptical, 20 mm. × 5 mm.; Flowers, not bracteate; Petals, 4, white, deeply bilobed; Style, 1.4 mm. in young fruit; Fruit, elliptical, 7 mm. × 4 mm. wide × 2 mm. thick, flattened parallel to papery internal partition.
- Tucker Gulch (lower),
Common within the city limits of Golden, along the creek of Tucker Gulch and the Tucker Gulch Trail, about 250 m. north of the First Street Bridge, and 350 m. south southwest of Ford Street.
Tom Schweich 1056.
10 Aug 2014.
(
CAS1142353‡
UC2045782‡
UCR266873‡
)
.
.
 Habitat of Berteroa incana |
 Coll. No. 1056, Berteroa incana |
Brassicaceae . Mustard Family. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower), On a small slump beside the creek. Along the Tucker Gulch recreational trail, 1.52 km north northwest of the GNIS location of Golden Tom Schweich 1335. 11 May 2016. . .
Capsella bursa-pastoris (L.) Medik. Shepherd's Purse. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, scapose, to 27 cm., hairs, sessile, stellate, 3-4 points, throughout; Leaves, basal, oblanceolate, 55 mm. × 16 mm. wide, deeply lobed, but not all the way to mid-rib; cauline, 4-5 stem leaves, lanceolate, 25 mm. × 10 mm. wide, base sagittate; Flowers, small, petals white; Fruit, obcordate, 4 mm. × 3.5 mm. wide. The single species in this genus; described by some as the second-most common weed on Earth (Described from Coll. No. 1336, 11 May 2016).
- Tucker Gulch (lower),
Common “weed” beside Tucker Gulch Trail.
230 m. north of the First Street bridge, 1.55 km north northwest of the GNIS location of Golden
Tom Schweich 1336.
11 May 2016.
(
CS
KHD00063529‡
)
.
.
 Coll. No. 1336, Capsella bursa-pastoris |
 Coll. No. 2017, Capsella bursa-pastoris |
Chorispora tenella (Pall.) DC. Crossflower. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, hairs 0, sparsely stalked-gland-dotted; Leaves basal, withered at flowering, cauline simple, not basally lobed or clasping; Flowers radial; Corolla purple; Stamens 6; Ovary linear when young; Fruit linear, bilateral, to 4 cm, seed in proximal 2.5 cm., tip pointed; Seeds in two rows, brown, 1 mm (Described from Coll. No. 301, 5 Nov 2012).
- Tucker Gulch (lower),
Small colony of this common early spring weed.
Disturbed area between paths, 1.33 km north northwest of the GNIS location of Golden
Tom Schweich 1330.
11 May 2016.
(
CDA0050050‡
COLO02348423‡
CS
KHD00063633‡
)
.
.
Hesperis matronalis L. Dame's Rocket. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm., hairs, forked on stem, leaf, and sepal, but not fruit; Leaves, basal, withered at flowering, cauline, petiole 3-5 mm. + blade 100 mm. × 35 mm. wide, lanceolate, margin, small-toothed; Inflorescence, raceme; Sepals, #4, 5-6 mm., green, margins purple; Petals, #4, 13 mm. × 4 mm. wide, clawed, purple; Fruit, silique, 40 mm. × 0.6 mm. wide; Seed, 1.7 mm., brown, glabrous (Described from Coll. No. 1441, 15 June 2016).
- Cressmans Gulch,
4551.
4/15/2026.
Picea pungens, Onopordum sp., Cynoglossum officinale, Acer negundo, Verbascum thapsus
left bank of Cressmans Gulch at mouth with Tucker Gulch
Tom Schweich 3555.
15 Apr 2026.
(
Undist.
)
.
.
 Hesperis matronalis in the ditch. |
 What the well-dressed botanist wears while chasing noxious weeds in the grass. |
 Coll. No. 1441, Hesperis matronalis |
 Coll. No. 2808, Hesperis matronalis |
Lunaria annua L. Money Plant. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Nautralized.
On both banks of Tucker Gulch near the City of Golden Tucker Gulch Trail between 1st Street and 7th Place, 1.45 km. north northwest of the GNIS location of Golden.
Tom Schweich 2479.
27 May 2021.
(
COLO2706703‡
KHD00075603‡
OBI185093‡
)
.
.
 Coll. No. 2479, Lunaria annua |
Nasturtium officinale W. T. Aiton. (Syn: Rorippa nasturtium-aquaticum (L.) Hayek ) Watercress. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb to 15 cm., aquatic, hairs 0; Caudex 0; Roots, fibrous, rooting at nodes; Stem decumbent, leafy; Leaves cauline, compound, pinnately divided, petioled, Inflorescence not bracted, not one-sided; Flowers radial; Sepals 2-2.3mm., ovate to obovate; Petals 2.5-4.0 mm., white, obovate to spoon-shaped, margins entire; Stamens 6; Filaments plain; Fruit, young linear, mature 13 mm. x 1.8 mm. wide; Ovules (seeds) many, 2 rows. Treated as native to California by TJM2 and Colorado by Ackerfield (2015), but alien by Weber & Wittmann (2012) and introduced by USDA Plants. (Described from Coll. No. 889, 23 August 2012, and 2133, 7 Jul 2019).
- Tucker Gulch (lower),
Urban flora, this location likely disturbed many times by road and other construction. Also collected here: Schoenoplectus tabernaemontani.
In the water of Tucker Gulch, the stream draining Golden Gate Canyon, between Joseph Circle and Colorado Highway 93, 2.92 km. northwest of the GNIS location of Golden.
Tom Schweich 2847.1
6 Jul 2022.
(
COLO
)
.
 Coll. No. 889, Nasturtium officiniale |
 Inflorescence of Coll. No. 2133, Nasturtium officinale |
 Inflorescence of Coll. No. 2133, Nasturtium officinale |
Cactaceae
Opuntia macrorhiza Engelm. Western Pricklypear. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial cactus, not distinctly mat-forming; Stem, segments, 90 mm. × 60 mm. wide, flattened, bluish-green, areoles, #5-6 per diagonal row, spaced 8-14 mm., proximal, glochids only, distal, glochids and spines, spines, #2, #1, 28 mm., erect, brown to tan at tip, #1, 12 mm., recumbent, nearly white; Flowers, petals, 36 mm. × 22 mm. wide, wedge-shaped, color yellow; Stamens, many, 18 mm., yellow; Style, 20-24 mm., stout; Stigma, lobes, #6-8, 3 mm.; Fruit, 38 mm. × 17 mm. wide, narrow at base, fleshy, green, areoles, mix of glochids and short spines. (Described from Coll. No. 1948, 15 June 2018.)
- Cressmans Gulch, 4575. 4/15/2026. .
- Tucker Gulch (lower),
determination tentative
Tom Schweich 2905.
7/6/2022.
.
 Coll. No. 2371, Opuntia macrorhiza |
 Opuntia macrorhiza on Schweich Hill. |
 Obs. No. 1540, Opuntia macrorhiza |
 Coll. No. 1948, Opuntia macrorhiza |
Cannabaceae
Celtis reticulata Torr. (Syn: Celtis laevigata Willd. var. reticulata L. D. Benson ) Net-Leaved Hackberry. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4570.
4/15/2026.
.
Caprifoliaceae
Dipsacus laciniatus L. Cutleaf Teasel. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4550.
4/15/2026.
.
.
 Coll. No. 2412, Dipsacus laciniatus, imaged by COLO. |
Lonicera tatarica L. Tatarian Honeysuckle. CalPhotos. Jepson eFlora. SEINet Taxon.
Shrub to small tree, 2 m.; Leaves, opposite, 24 mm. × 17 mm. wide, simple, entire, petiole, 1.5 mm.; Peduncle, 10-13 mm.; Flowers, in pairs, subtended by bracts, bisexual; Bracts, small, at base of calyx; Calyx, tube 2.0 mm. + lobes 0.5-1.0 mm.; Corolla, tube 12.5 mm. + lobes 12 mm., pink, hairy inside; Ovary, inferior; Stamens, #5, exserted, versatile; Style, #1, exserted, hairy; Stigma, capitate. Disturbed places, native to Siberia, sporadic escapee from cultivation, berries possibly toxic. (Described from Coll. No. 1591, 2 May 2017.)
- Cressmans Gulch,
4573.
4/15/2026.
bottom of gulch
Tom Schweich 3557.
15 Apr 2026.
(
Undist.
)
.
.
 Coll. No. 1591, Lonicera tatarica |
 Coll. No. 2501, Lonicera tatarica |
 Coll. No. 3017, Lonicera tatarica. |
 Coll. No. 1591, Lonicera tatarica |
 Coll. No. 1705, Lonicera tatarica |
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.
- Cressmans Gulch,
4562.
4/15/2026.
.
Caryophyllaceae
Saponaria officinalis L. Bouncingbet. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
iNaturalist Observation 187022544.
Tom Schweich 3464.
10/9/2023.
iNaturalist Observation 187024275.
Tom Schweich 3465.
10/9/2023.
.
 Saponaria officinalis |
Cleomaceae
Cleomella serrulata (Pursh) Roalson & J. C. Hall. (Syn: Cleome serrulata Pursh , Peritoma serrulata (Pursh) DC. ) Rocky Mountain Bee Plant. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Tom Schweich 983.
8/10/2014.
.
 Coll. No. 3196, Cleomella serrulata. |
Convolvulaceae
Convolvulus arvensis L. Field Bindweed. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4548.
4/15/2026.
.
 Habitat of Coll. No. 1220, Convolvulus arvensis |
 Coll. No. 1220, Convolvulus arvensis |
Cornaceae
Cornus sericea L. (Syn: Swida sericea (L.) Holub. ) Creek Dogwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, Gray bark, determination tentative. 4545. 4/15/2026. .
Elaeagnaceae
Elaeagnus angustifolia L. Russian Olive. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4539. 4/15/2026. 4566. 4/15/2026. .
- Tucker Gulch (lower),
iNaturalist Observation 183896530.
Tom Schweich 3420.
9/18/2023.
iNaturalist Observation 183895541.
Tom Schweich 3422.
9/18/2023.
iNaturalist Observation 187026947.
Tom Schweich 3467.
10/9/2023.
iNaturalist Observation 187045055.
Tom Schweich 3468.
10/9/2023.
iNaturalist Observation 187045599.
Tom Schweich 3469.
10/9/2023.
iNaturalist Observation 187046896.
Tom Schweich 3470.
10/9/2023.
iNaturalist Observation 187047989.
Tom Schweich 3471.
10/9/2023.
.
 Coll. No. 1645, Elaeagnus angustifolia |
 Coll. No. 1437, Elaeagnus angustifolia |
Euphorbiaceae
Euphorbia esula L. [misapplied]. (=Euphorbia virgata Engelm.) Leafy Spurge. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4547. 4/15/2026. .
- Tucker Gulch (lower),
Weed: CO DofA, List: B.
Disturbed area between paths, 1.33 km north northwest of the GNIS location of Golden
Tom Schweich 1331.
11 May 2016.
(
CAS
CDA0050049‡
KHD00063910‡
OBI83164‡
UC
UCR277951‡
)
.
.
 Habitat of Coll. No. 1795, Euphorbia esula |
 Coll. No. 1657, Euphorbia esula |
 Coll. No. 1733, Euphorbia esula |
 Coll. No. 2473.1, Euphorbia esula |
Euphorbia myrsinites L. (Syn: Tithymalus myrsinites (L.) Hill ) Myrtle Spurge. Weed: CO DofA, List: A. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
iNaturalist Observation 183895948.
Tom Schweich 3421.
9/18/2023.
.
Fabaceae
Medicago sativa L. Alfalfa. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4569. 4/15/2026. .
Fumariaceae
Fumaria vaillantii Loisel. Earthsmoke. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Slope above creek.
Very few plants here, but more on the north bank of Clear Creek, cf., my Coll. No. 2484.
On east bank of Tucker Gulch near the City of Golden Tucker Gulch Trail between 1st Street and 7th Place, 1.51 km. north northwest of the GNIS location of Golden.
Tom Schweich, with Cindy Trujillo 2480.
27 May 2021.
(
KHD00075601‡
)
.
 Earthsmoke (Fumaria vaillantii beside Clear Creek Trail. |
Grossulariaceae
Ribes aureum Pursh. Golden Currant. CalPhotos. Jepson eFlora. SEINet Taxon.
Coll. No. 1319, 4 May 2016: Perennial shrub, to 1 m.; Stem, unarmed; Leaves, fascicled, broadly ovate, 29 mm. × 22 mm. wide, lobes 3, obtuse; Hypanthium, 9 mm., bright yellow; Sepals, petaloid, 5 mm.; Petals, 2.5 mm.; Ovary, 2 mm.
- Cressmans Gulch,
4567.
4/15/2026.
.
 Habitat of Coll. No. 1834, Ribes aureum. |
 Grossulariaceae Ribes aureum |
 Grossulariaceae Ribes aureum |
 Ribes aureum in winter. |
 Twigs of Ribes aureum in winter. |
 Coll. No. 1834, Ribes aureum. |
Lamiaceae
Nepeta cataria L. Catnip. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm.; Stem, square, hispid; Leaves, opposite, petiole, 8 mm., blade, 40 mm. × 19 mm. wide, reduced above, deltoid-chordate, margin, crenate, abaxial densely hispid, rather than tomentose per Ackerfield (2015), tip, acute; Inflorescence, flower clusters arising from axils, flowers pedicillate; Calyx, lobes sharply acute but lacking spines or bristles; Corolla, 2-lipped, white (Described from Coll. No. 2214, 29 August 2019).
- Cressmans Gulch, 4542. 4/15/2026. .
Malvaceae
Malva neglecta Wallr. Common Mallow. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4564. 4/15/2026. .
Oleaceae
Syringa vulgaris L. Common Purple Lilac. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4555. 4/15/2026. .
Onagraceae
Epilobium hirsutum L. Hairy Willowherb. Weed: CO DofA, List: A. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
in the concrete gulch between 9th and 10th Streets
Tom Schweich 2006.
9/14/2020.
in the concrete ditch between 10th Street and the end of Water Street.
Tom Schweich 2007.
9/14/2020.
in the concrete gulch below the bridge from East Street to Vanover Park.
Tom Schweich 2008.
9/14/2020.
.
Papaveraceae
Argemone polyanthemos (Fedde) G.B. Ownbey. Crested Prickly Poppy. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Tom Schweich 2907.
7/6/2022.
.
Plantaginaceae
Linaria dalmatica (L.) Mill. (Syn: Linaria dalmatica (L.) Mill. ssp. dalmatica , Linaria genistifolia (L.) Mill. ssp. dalmatica (L.) Maire & Petitm. ) Dalmatian ToadFlax. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Tom Schweich 2902.
7/6/2022.
.
.
Veronica anagallis-aquatica L. Water Speedwell. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Flowing water of gulch lined by cottonwoods (Populus deltoides), box elders (Acer negundo) and chokecherries (Prunus virginiana).
Native to temperate Eurasia to tropical mountains; widespread non-native in North America.
Bed of Tucker Gulch, the stream that drains Golden Gate Canyon, 75 m. west of North Ford Street, 2.57 km. north northwest of the GNIS location of Golden.
Tom Schweich 2844.
6 Jul 2022.
.
.
Veronica biloba L. (Syn: Pocilla biloba (L.) W. A. Weber ) Twolobe Speedwell. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Also collected nearby: Lithospermum arvense, Alliaria petiolata, Lunaria annua, and Fumaria vaillantii.
In a sunny spot beside the city of Golden Tucker Gulch Trail, between 1st Street and 7th Place, 1.54 km. north northwest of the GNIS location of Golden.
Tom Schweich 2482.
27 May 2021.
(
COLO2707305‡
UCR
)
.
 Veronica biloba L. |
 Veronica biloba L. |
 Fruit of Coll. No. 2063.1, Veronica biloba |
 Coll. No. 2063.1, Veronica biloba |
Polygonaceae
Fallopia baldschuanica (Regel) Holub. Bukhara Fleeceflower. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
4394.
9/8/2025.
Sprawling over a green ash (Fraxinus pennsylvanica Marshall) and fence for about 10 m., coming across onto the City of Golden Tucker Gulch Trail, no sign of rooting away from fence line.
Also seen on top of Cemetery Hill (Gregory Drive), and 1000 19th Street.
iNaturalist Observation 185490713.
EDDMapS Record ID 11556331.
Side yard of 405 Garden Glen Ct., Colden, CO.
Tom Schweich 3230.
29 Sep 2023.
(
CDA56581‡
CS202037‡
JCOS
KHD ‡
OBI
)
.
.
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).
- Cressmans Gulch,
Tom Schweich 1946.
6/12/2020.
.
.
 Coll. No. 2079, Rumex acetosella |
 Inflorescence of Coll. No. 1841, Rumex acetosella |
 Coll. No. 1841, Rumex acetosella |
Rumex crispus L. Curley Dock. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4556.
4/15/2026.
4582.
4/15/2026.
.
 Coll. No. 2817, Rumex crispus |
 Coll. No. 818, Rumex crispus |
Ranunculaceae
Delphinium nuttallianum Pritz. Twolobe Larkspur. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4577.
4/15/2026.
.
.
Ranunculus acris L. Tall Buttercup. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 30 cm., aquatic; Leaves, mostly basal with few cauline, compound, deeply parted, margins toothed; Petioles, spreading hairs; Flowers, actinomorphic, sepals, present, 9 mm. × 2.5 mm. wide, ovate, hairy, white/translucent, petals, yellow, 17 mm. × 12.5 mm. wide, obovate, notched, not spurred; Pistil, many; Achenes, immature, small, glabrous, abruptly curved short beak (Described from Coll. No. 2274, 12 May 2020).
- Tucker Gulch (lower),
Rooted in the lowest bank of the creek. Also collected nearby: Chorispora tenella, Euphorbia esula, Alopecurus arundinaceus, and Poa bulbosa.
Creekside just below the First Street Bridge, 1.69 km. north northwest of the GNIS location of Golden
Tom Schweich 2274.
12 May 2020.
(
CAS
CDA0053733‡
COLO2433746‡
KHD00072972‡
OBI149335‡
UCR
)
.
.
 Coll. No. 2274, Ranunculus sp. |
 More Ranunculus sp. Nearby. |
 Coll. No. 2274, Ranunculus acris |
 Coll. No. 3287, Ranunculus acris. |
 Flower of Coll. No. 2274, Ranunculus acris |
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).
- Tucker Gulch (lower),
In a small slump beside creek.
135 m. north of First Street bridge, 1.46 km north northwest of the GNIS location of Golden
Tom Schweich 1333.
11 May 2016.
(
CS
KHD ‡
UCR
)
.
 Coll. No. 2957, Ranunculus repens. |
 Coll. No. 1333, Ranunculus repens |
 Basal leaf of Coll. No. 1333, Ranunculus repens |
Rosaceae
Prunus americana Marshall. American Plum. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial woody shrub, spreading, to 2 m., blooming before leafing out; Branches, unarmed, glabrous when young, peeling to brown; Leaves, (immature, at time of flowering), simple, 15-19 mm. × 5.5-8 mm. wide, lanceolate or elliptic-rhomboid, pinnately veined, glabrous, margin toothed, teeth eglandular, base slightly hairy, petiole 3 mm., adaxially hairy; Flowers, in small groups of 2-3; Pedicels, 9-18 mm., glabrous to sparsely hairy; Hypanthium, 2 mm.; Sepals, 2.5-2.8 mm., reflexed, few cobwebby hairs adaxially; Petals, free, white, 5-7 mm. × 2.5-4.5 mm. wide; Stamens, many (30?); Ovary superior; Styles #1, 10 mm.; Fruit unknown (Described from Coll. No. 1093, 30 Apr 2015, and Coll. No. 1819, 16 May 2018).
- Cressmans Gulch,
4560.
4/15/2026.
.
.
Prunus virginiana L. Chokecherry. CalPhotos. Jepson eFlora. SEINet Taxon.
The most useful distinction is between chokecherries found east of the Rocky Mountains, var. virginiana and those found from the mountains westward, var. demissa. Plants of the High Plains show intergradation between those of the Rockies and those of the East.
- Cressmans Gulch, 4557. 4/15/2026. 4580. 4/15/2026. .
- Tucker Gulch (lower),
Common native shrub or small tree thriving in urban habitat.
North bank of Tucker Gulch, the stream draining Golden Gate Canyon, above the stream, 130 m. along gulch generally west of North Ford Street, 2.61 km. north northwest of the GNIS location of Golden.
Tom Schweich 2845.
6 Jul 2022.
.
.
Rosa L. Rose. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, prickles on new growth, nine leaflets. 4572. 4/15/2026. .
Rubiaceae
Galium aparine L. (Syn: Galium aparine L. var. echinospermum (Wallr.) Farw. , Galium spurium L. ) Sticky Willy, Cleavers. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual/perennial unknown, weak-stemmed and scrambling through shrubs and grass; Stem, retrorsely scabrous on angles (but not densely so); Leaves, whorls of 6-8 (more leaves above, fewer below), 46 mm. × 4 mm. wide, oblanceolate, margins retrorsely scabrous, tips with a short spine; Flowers, corolla, greenish-white, lobes 1 mm.; Fruit, 1.3 mm., covered with hooked hairs (Described from Coll. No. 1395, 8 June 2016).
- Cressmans Gulch,
4543.
4/15/2026.
.
 Coll. No. 1395 Galium aparine |
Salicaceae
Populus deltoides Marshall ssp. monilifera (Aiton) Eckenw. (Syn: Populus sargentii Dode ) Plains Cottonwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, pistillate 4559. 4/15/2026. .
- Tucker Gulch (lower),
northeast (left) bank of creek
Tom Schweich 2901.
7/6/2022.
.
.
Salix . Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Eight to ten plants on both sides of creek with roots in water.
Material combined with Coll. No. 1103.
On the lower banks adjacent to creek, lower Tucker Gulch, about 260 meters north northwest of the First Street bridge.
Tom Schweich 1073.
16 Mar 2015.
(
Golden
)
Clump of five to six plants, ±1 meter above creek.
Along the creek in lower Tucker Gulch, about 100 meters north northwest of the First Street bridge.
Tom Schweich 1074.
16 Mar 2015.
(
Discarded.
)
Salix, match with Coll. No. 1074.
Tom Schweich 1104.
11 May 2015.
(
Discarded.
)
.
.
Salix alba L. White Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial upright shrub to 4 m., growing into multiple-trunked tree to 10 m.; Twigs, yellow-brown, glabrous (not pruinose), current-year growth not available; Bud, scale margins connate; Leaves, alternate, 39 mm. × 9.5 mm. wide, = 4.1×long vs. wide, mid-vein slightly long hairy, margins hairy, otherwise leaves glabrous, youngest leaves with margins glandular-toothed, petiole, 3 mm., eglandular, deeply grooved adaxially; Plants, staminate, no pistillate material found. Catkins, 50 mm., not branched, arising from subterminal buds; Stamens 2, Filaments, 3 mm., not connate; Anthers, 0.7 mm.; Capsules, unknown. Described from Coll. No. 1103, 11 May 2015.
- Tucker Gulch (lower),
Eight to ten plants on both sides of creek with roots in water, plus 2 multi-trunk trees approximately 100 meters upstream.
Contains materials matched from Coll. No. 1073, 16 Mar 2016.
On the lower banks adjacent to creek, lower Tucker Gulch, about 260 meters north northwest of the First Street bridge.
Tom Schweich 1103.
11 May 2015.
(
CS
KHD00060556‡
UCR277967‡
)
.
.
 Coll. No. 1073, Salix alba |
 Coll. No. 1073, Salix alba |
 Salix alba along Tucker Gulch. |
 Salix alba trunks along Tucker Gulch. |
Salix exigua Nutt. Coyote Willow, Narrow-Leaved Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial erect shrub, to 2 m.; Leaves, alternate, 21 mm. ×. 1.8 mm. wide, 11.7 ×long as wide, abaxial villous, adaxial mostly glabrous, margins entire, slightly revolute; Staminate catkins, 30 mm. × 6 mm. wide; Pistillate catkins, 42 mm. × 4 mm. wide, floral bract, 1.8 mm., capsule, 2.6 mm., glabrous (Described from Coll. No. 1880, 24 May 2018).
- Cressmans Gulch, 4558. 4/15/2026. .
- Tucker Gulch (lower),
northeast (left) bank of creek
Tom Schweich 2900.
7/6/2022.
.
.
 Pistillate catkin of Coll. No. 1880, Salix exigua |
 Staminate catkin of Coll. No. 1880, Salix exigua |
Salix irrorata Andersson. Dewystem Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
Tom Schweich 3559.
15 Apr 2026.
(
Undist.
)
.
 Coll. No. 3549, Salix irrorata. |
 Coll. No. 2490, Salix irrorata. |
 Coll. No. 3456, Salix irrorata. |
 Coll. No. 3550, Salix irrorata |
Sapindaceae
Acer negundo L. (Syn: Acer negundo L. var. interius (Britton) Sarg. , Negundo aceroides (L.) Moench ) Box Elder. CalPhotos. Jepson eFlora. SEINet Taxon.
Tree, ±5 m.; Branches, young, soft short hairy (var. interius); Leaves, opposite, ternately compound, leaflets 3; Pistil 1; Stigma, branches 2; Fruit, 2 winged 1-seeded samaras. (Described from Coll. No. 1102, 11 May 2015).
- Cressmans Gulch, 4540. 4/15/2026. .
- Tucker Gulch (lower),
Probably var. interius (Britton) Sarg.
Along Tucker Gulch, near its junction with Cressmans Gulch, about 220 m below Ford Street, and 400 m above First Street.
Tom Schweich 1102.
11 May 2015.
(
KHD00060214‡
)
northeast (left) bank of creek
Tom Schweich 2899.
7/6/2022.
.
 Coll. No. 2457, Acer negundo. |
 Emerging staminate flowers of Acer negundo. |
 Britton & Shafer (1908) Figure 608, Acer interior. |
 Coll. No. 1102, 11 May 2015 |
 Coll. No. 2451, Acer negundo |
Simaroubaceae
Ailanthus altissima (Mill.) Swingle. Tree of Heaven. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
iNaturalist Observation 187025492.
Tom Schweich 3466.
10/9/2023.
.
 Mature Tree of Heaven on Garden Glen Court. |
 Samara (fruit) of Ailanthus altissima “Tree of Heaven.” |
 Tree of Heaven saplings infesting a front lawn. |
 Mature Tree of Heaven on Maple Street. |
Solanaceae
Lycium chinense Mill. Chinese Desert-Thorn. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, herbaceous, sprawling; Stem, thorn, #1, 6 mm.; Leaves, alternate, petioles 5 mm., blade 44 mm. × 12 mm. wide, lanceolate to obovate, entire; Sepals, tube 4 mm. + lobes 1 mm., triangular; Corolla, united at base, tube 4 mm. + lobes #5, 5-6 mm. × 3.2 mm., radially symmetrical; Stamens, #5; Ovary, unknown; Stigma, entire. Corolla tube < lobes and ±hidden by calyx = L. chinense Mill. per Jepson Manual of California. Described from Coll. No. 2846, 6 Jul 2022.
- Tucker Gulch (lower),
Weedy slope with Bromus inermis, Euphorbia esula, Ulmus pumila, etm.
North boundary of City of Golden parcel, sprawling down slope with yard waste from adjacent privately-owned parcel, about 140 m. west northwest of North Ford Street. 2.64 km. northwest of the GNIS location of Golden.
Tom Schweich 2846.
6 Jul 2022.
(
KHD00079831‡
)
.
 Coll. No. 2486, Lycium chinense |
 Flower of Coll. No. 2486, Lycium chinense |
 Flower of Coll. No. 2486, Lycium chinense |
 Scan of Coll. No. 2486, Lycium chinense |
Ulmaceae
Ulmus pumila L. Siberian Elm. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4552.
4/15/2026.
4574.
4/15/2026.
.
 Figure 1. Composite photo of Siberian elm (Ulmus pumila L.) |
Vitaceae
Parthenocissus quinquefolia (L.) Planch. (Syn: Parthenocissus inserta (A.Kern.) Fritsch ) Virginia Creeper. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4554.
4/15/2026.
.
 Virginia creeper (Parthenocissus quinquefolia) out-competing bladder senna (Colutea arborescens) in Cressman Gulch. |
Araceae
Lemna minor L. Common Duckweed. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Also collected nearby: Salix alba, Berteroa incana, Capsella bursa-pastoris, Heterotheca villosa, Poa bulbosa, and Muscari botryoides.
Running water in a little spring-fed perennial stream tributary to Tucker Gulch, 250 m. upstream of the First Street bridge, 1.98 km. north northwest of the GNIS location of Golden.
Tom Schweich 2275.
12 May 2020.
(
KHD00072973‡
OBI149334‡
)
.
 Coll. No. 2275, Lemna minor |
Asparagaceae
Muscari botryoides (L.) Mill. Common Grape Hyacinth. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
Naturalized.
Beside Tucker Gulch Trail, about 100 m. north of the First Street bridge, 1.42 km north northwest of the GNIS location of Golden
Tom Schweich 1332.
11 May 2016.
(
KHD00063423‡
UCR277969‡
)
.
.
 Coll. No. 1310, Muscari botryoides |
 Coll. No. 1786, Muscari botryoides |
Yucca glauca Nutt. Soapweed Yucca. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4576.
4/15/2026.
.
 Yucca glauca “Soapweed Yucca” on Dakota Ridge. |
Cyperaceae
Schoenoplectus tabernaemontani (C.C.Gmel.) Palla. (Syn: Scirpus lacustris L. var. validus (Vahl) Kük. , Scirpus validus Vahl ) Softstem Bulrush. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower),
In the water of Tucker Gulch, the stream draining Golden Gate Canyon, between Joseph Circle and Colorado Highway 93, 2.92 km. northwest of the GNIS location of Golden.
Tom Schweich 2847.
6 Jul 2022.
(
CAS
CS201817‡
EIU
FLD
REGIS
)
.
 Coll. No. 1962, Schoenoplectus tabernaemontani |
Iridaceae
Iris L. Horticultural Iris. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch, 4553. 4/15/2026. .
Poaceae
Alopecurus aequalis Sobol. Shortawn Foxtail. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower), Swampy place. United States, Colorado, Jefferson, Tucker's Gulch, near Golden Lois S. Ehlers 297. 16 Jul 1922. ( MICH1404312‡ MICH1404313‡ ) . .
Alopecurus arundinaceus Poir. Creeping Reed Foxtail. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, to 90 cm., rhizomatous; Leaves, Sheath, open, 10 cm.; Ligule, membraneous, 2 mm.; Auricles, 0; Blade, flat, 10 cm., glabrous, finely scabrous on margins; Inflorescence, spike-like, 80 mm. × 12 mm. wide, contracted panicle of up to 4 branches, spikelets many; Rachis, glabrous; Compression, lateral; Spikelets, similar, 1 per node, 1-flowered; Florets, 1 per spikelet; Glumes, #2, 4.5 mm., ±equal, keeled ciliate, veins 3, awns 0, apex acute, apices divergent; Lemma, 4 mm., < glumes, membraneous, keeled, glabrous, veins parallel, apex truncate to obtuse, awns #1, 1-2 mm., straight, attached middle; Palea, absent; Stamens, #3 (Described from Coll. No. 1334, 11 May 2016).
- Tucker Gulch (lower),
Growing adjacent to running water in creek.
135 m. north of First Street bridge, 1.46 km north northwest of the GNIS location of Golden
Tom Schweich 1334.
11 May 2016.
(
CS
KHD00063432‡
UCR277968‡
)
Rooted in the lowest bank of the creek. Also collected nearby: Chorispora tenella, Euphorbia esula, Ranunculus acris, and Poa bulbosa.
Same as Coll. No. 1334, 11 May 2016, made 200 m. upstream.
Creekside just below the First Street Bridge, 1.69 km. north northwest of the GNIS location of Golden
Tom Schweich 2274.1
12 May 2020.
(
CAS
CDA0053734‡
OBI149329‡
)
.
.
 Schweich collection of Alopecurus arundinaceus |
 Coll. No. 2274.1, Alopecurus arundinaceus. |
Bromus inermis Leyss. (Syn: B. inermis Leyss. ssp. inermis ) Smooth Brome. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass to 1 m., rhizomatous; Leaves, sheath, 8-11 cm., closed, ligule, <1 mm., membraneous, blade, 12-17 cm × 0.5 cm., flat, soft, with a distinguishing fold, usually described as an “M” or a “W” that is difficult to see when dry; Inflorescence, panicle, 15 cm. × 4 cm. wide, multiple 1° branches per node, mostly on one side of rachis; Spikelets, 1 per node on 1° and 2° panicle branches, 15-24 mm. × 5 mm. wide, laterally compressed, 2-6 florets per spikelet; Glumes, 2, keeled, glabrous, lower, 7-8 mm., veins 1 upper, 8-10 mm., <lowest floret; Rachilla, sparsely hairy on abaxial side, extended beyond uppermost floret or not; Callus, small, glabrous; Lemma, 11-12 mm., veins, 3, 5, 7, obvious, tip bifid, some awned; Awn (when present), 1.0-1.6 mm., arising near tip of lemma; Palea, 9 mm., veins ciliate. (Described from Coll. No. 1113, 26 May 2014, and Coll. No. 1219, 16 Jul 2015).
- Tucker Gulch (lower),
Streamside with cottonwoods (Populus deltoides), box elders (Acer negundo) and chokecherries (Prunus virginiana).
Valuable agricultural grass that is invasive of native grasslands.
North bank of Tucker Gulch, the stream that drains Golden Gate Canyon, just west of North Ford Street, 2.55km. north northwest of the GNIS location of Golden.
Tom Schweich 2843.
6 Jul 2022.
.
.
Phleum pratense L. Timothy. CalPhotos. Jepson eFlora. SEINet Taxon.
- Cressmans Gulch,
4538.
4/15/2026.
.
.
 Collection No. 501 |
 Coll. No. 1216, Phleum pratense |
 So, are there short awns? And what's with the truncate(?) glumes? |
 Collection No. 501, Phleum pratense L. Timothy. |
Poa bulbosa L. Bulbous Bluegrass. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tucker Gulch (lower), Along the Tucker Gulch trail, 70 m. north of the First Street bridge, 1.4 km north northwest of the GNIS location of Golden. Tom Schweich 1114. 26 May 2015. ( CAS KHD56953‡ OBI82129‡ UC UCR265988‡ ) .
| Total number of taxa: | 78 |
| Native Taxa: (serif, italic, bold) | 29 |
| Exotic Taxa: (sans-serif, italic) | 46 |
| Nativity Undetermined: (default font, italic) | 3 |
| Listed Weeds: Identified as Weed | 14 |
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.
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Date and time this article was prepared: 8/1/2026 3:22:49 PM.
