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 Mesquite Mountains, San Bernardino County, United States.

Ephedraceae

Ephedra nevadensis S. Watson.  Nevada Ephedra. CalPhotos. Jepson eFlora. SEINet Taxon.

- Shadow Valley, Staminate plant, no pistillate plants in immediate area. Location of my collections 1569 to 1574. On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1573. 18 Apr 2017. ( COLO CS EIU UC ) .

Asteraceae

Ambrosia dumosa (A. Gray) W. W. Payne.  (Syn: Franseria d. A. Gray ) White Bur-Sage, Burroweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Common with Creosote Bush (Larrea tridentata). Tom Schweich 224. 4/22/2004. .

- Shadow Valley, Location of my collections 1569 to 1574. On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1571. 18 Apr 2017. ( COLO02348803^‡ CS EIU REGIS UC2080702^‡ ) . .

Ambrosia eriocentra (A. Gray) Payne.  Wooly Bur-Sage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Common in washes. Tom Schweich 227. 4/22/2004. . .

Ambrosia salsola (A. Gray) Strother & B. G. Baldwin.  (Syn: Hymenoclea salsola Torr. & A. Gray ) Cheesebush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, In Creosote Bush scrub, just west of the Winters Pass Hills, on Kingston Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 333. 20 April 2004. ( UC1953377^‡ ) .

- Shadow Valley, Also collected here, Coll. No. 1575, Yucca schidigera. Along Kingston Road, 13.4 miles north of US Interstate 15 on Kingston Road, and 0.9 miles northeast of the intersection of Kingston Road and Excelsior Mine Road. Tom Schweich 1576. 18 Apr 2017. ( CDA0050038^‡ COLO02348894^‡ CS EIU036412^‡ REGIS ) . .

Baileya multiradiata Harv. & A. Gray ex Torr.  Desert Marigold. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual (biennial or short-lived perennial), to 40-50 cm., ±gray-tomentose, scapose; Leaves alternate, petiole 40 mm. + blade 25 mm., ovate, pinnate-lobed; Inflorescence, heads solitary, radiate, 3.5-4.0 cm. dia., flowers of two kinds, some with strap-shaped corollas; Head, hemispheric, radiate; Involucre 6 mm.; Phyllaries, in 2+ series, overlapping, ±equal, erect, tomentose, margins not scarious, long spreading hairs; Receptacle, hemispheric, epaleate; Pappus 0; Ray flowers, #32+, corolla, yellow, 13 mm. × 9 mm. wide, 3-lobed, when dry persistent papery reflexed; Fruit achene, 3.5 mm., ±equally ribbed, ±smooth (minutely papillate on ribs), observed to be compressed in one specimen (Described from Coll. No. 7.4, 16 April 1993, Coll. No. 291, 26 May 2001, and Coll. No. 337.1, 20 Apr 2004).

- Mesquite Mountains, In Creosote Bush scrub, just west of the Winters Pass Hills, on Kingston Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 337.1 20 April 2004. ( ? UCR248650^‡ ) . .

Chaenactis carphoclinia A. Gray var. carphoclinia.  Pebble Pincushion. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 20 cm., tap-rooted; Leaves, basal and cauline, to 40 mm., finely pinnately 2° divided, margins not spiny; Inflorescence, no strap-shaped flowers, flowers of 1 kind; Phyllaries, in 2 overlapping series; Receptacle paleate, 9 mm., appearing ≥1 mm. above buds; Pappus of short, 0.6 mm., scales (Described from Coll. No. 348, 20 April 2004).

- Winters Pass, Winters Pass is on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just west of the pass. Tom Schweich 348. 20 April 2004. ( UCR248652^‡ ) . .

Chaenactis fremontii A. Gray.  Desert Pincushion. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, tap-rooted, to 35 cm.; Stem variously branched, proximal hairs 0, distally minutely glandular; Leaves, alternate, to 7 cm., deeply pinnately lobed below to entire above; Inflorescence, single heads on 5 cm. peduncles, flowers of two kinds in same heads, outer corollas not strap- shaped, head radiant; Phyllaries in 2+ series, ±equal length, outermost sometimes subtending a ray flower, without embedded oil gland, margin green, tip acute; Pappus of scales, few, one long (6 mm.) appearing among disc flowers remainder short, margins ragged; Corollas white; Fruit, 6 mm., dark brown (Described from Coll. No. 330, 20 Apr 2004).

- Shadow Valley, In Creosote Bush scrub, just west of the Winters Pass Hills, on Kingston Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 330. 20 April 2004. ( ? CAS1157588^‡ UCR248613^‡ ) . .

Cirsium neomexicanum A. Gray.  Desert Thistle. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual or biennial, to 60 cm., Stem, tomentose, ribbed; Leaves, alternate, 40 mm., sessile, not clasping, lanceolate, spiny lobed (not compound), both surfaces wooly; Inflorescence, solitary heads, no flowers with strap-shaped corollas, flowers of 1 kind; Involucre to 25 mm. × 60 mm. wide; Phyllaries, in many series, abaxial face without, or with very small, resinous ridge, outer margins variously minutely decorated (with hairs, spines, and cilia), inner entire, tip spines 8 mm.; Receptacle, simple bristles, 4 mm.; Corolla, tube 13 mm. + throat 7 mm. + lobes 9 mm. (Described from Coll. No. 354, 20 April 2004).

- Mesquite Mountains, Alongside the road, 2.15 mi (3.46 km) northeast of Winters Pass on Kingston Road, near the rock shelter and cattle guard. Tom Schweich 354. 20 April 2004. ( UC UCR248648^‡ ) . .

Ericameria linearifolia (DC.) Urb. & J. Wussow.  Narrowleaf Goldenbush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1581. 18 Apr 2017. ( COLO02348795^‡ CS EIU UC2080711^‡ ) . .

Eriophyllum wallacei (A. Gray) A. Gray.  (Syn: Antheropeas wallacei (A. Gray) Rydberg ) Woolly Easter Bonnets. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, tap-rooted, wooly, to 4 cm., cobwebby, not gland-dotted; Leaves, cauline, alternate, to 9 mm., sessile or very short-petioled, obovate, entire, without embedded oil glands; Peduncle, (6)8-15 mm.; Inflorescence, some flowers with strap-shaped corollas, head radiate, composed of 2 kinds of flowers; Phyllaries, in 1 series (ஃequal), flat, 5 mm., without embedded oil glands; Receptacle epaleate, conical (TJM2 says “hemispheric”), slightly pitted; Pappus, 6-8 short (0.5 mm.) scales, ±equal, on both ray and disk flowers; Corollas, yellow, ray tube 1 mm. + blade 5 mm., not papery, deciduous; Anther tips awl-like (almost look hair-like); Fruit, 2 mm., black, some appressed hairy (Described from Coll. No. 118, 29 April 1997, and Coll. No. 278, 24 Apr 2001)

- Mesquite Mountains, In Creosote Bush scrub, on Kingston Road, south of the Winters Pass Hills, 13 mi (20.9 km) north of Valley Wells, 5.2 mi (8.4 km) south southwest of Winters Pass, near the Mesquite Mountains, 79 km southwest of Las Vegas, Nevada. Tom Schweich 340.2 20 April 2004. ( UC1953378^‡ ) Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1580. 18 Apr 2017. ( COLO02348902^‡ CS EIU UC2080712^‡ ) . .

Porophyllum gracile Benth.  Odora. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Near Kingston Road, 2.25 mi (3.62 km) north northeast of Winters Pass, 69 km southwest of Las Vegas, Nevada. Tom Schweich 379. 22 April 2004. ( UC1953382^‡ ) . .

Rafinesquia californica Nutt.  California Chicory. CalPhotos. Jepson eFlora. SEINet Taxon.

- Shadow Valley, In Creosote Bush scrub, on Kingston Road about 0.4 mi north of the intersection with Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 331. 20 April 2004. ( CAS1131496^‡ UC2015256^‡ ) . .

Rafinesquia neomexicana A. Gray.  Desert Chicory. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual herb, to 35 cm.; Stem, glabrous, branching various, from base to distal ½; Leaves, basal and cauline, alternate, length 7.5 cm. × 2.5 cm. wide, much reduced above, lanceolate, deeply pinnately divided; Inflorescence, heads enclosed by an involucre, overtopping the leaves; Involucre, near cylindric, 22 mm.; Phyllaries, unequal, in 3+ graduated series, 8-22 mm., margins flat, chartaceous, centers green; Receptacle, epaleate; Flowers, rays only, surpassing phyllaries by 5-10 mm., Pappus, many well-developed plumose bristles, ±equal; Fruit, 6 mm., light brown, beak 4 mm. Described from Coll. No. 1569, 18 April 2017.

- Shadow Valley, Location of my collections 1569 to 1574. On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1569. 18 Apr 2017. ( COLO02348811^‡ CS EIU UC2080700^‡ ) . .

Xylorhiza tortifolia (Torr. & A. Gray) Greene var. tortifolia.  Mojave Woody Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 30 cm., glandless; Stem ascending, wooly; Leaves, cauline, alternate, lanceolate, 45 mm. × 5 mm. wide, margins wavy, spiny-dentate, tip spined; Inflorescence, large heads solitary on 5+ cm. peduncles, flowers of two kinds, rays ligulate, radiate; Phyllaries, in 3 series, overlapping, not in vertical ranks, inner longer and thinner, 6,7,8 mm. × 1.5- 1.0 mm. wide, without oil glands; Receptacle, hemispheric or conic, epaleate; Pappus, well developed bristles, ≥24, disc pappus single, cylindric; Corolla, rays 20 mm. blue, disc yellow; Fruit, 3 mm (Described from Coll. No. 342, 20 April 2004).

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1583. 18 Apr 2017. ( COLO02348779^‡ CS EIU036413^‡ UC2080708^‡ ) .

- Winters Pass, Winters Pass is on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just west of the pass. Tom Schweich 342. 20 April 2004. ( ? CAS1157587^‡ UCR248651^‡ ) .

Bignoniaceae

Chilopsis linearis (Cav.) Sweet ssp. arcuata (Fosb.) Henrickson.  Desert Willow. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Occasional in washes. Tom Schweich 228. 4/22/2004. .

Boraginaceae

.  Borage Family. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1588.5 18 Apr 2017. . .

Amsinckia tessellata A. Gray var. tessellata.  Bristly Fiddleneck. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, tap-rooted, to 25-30 cm., green, non-parasitic, inland; Stem, erect, straight hairy; Leaf, alternate, 50-65 mm. × 6-14 mm. wide, somewhat reduced above, entire, bulbous hairy, not glaucus; Inflorescence, coiled, spike-like cyme; Calyx, 2-3 lobes separate + 1-2 lobes fused = 3-4 lobes, notched at tip, white hairy; Receptacle conic (not as conspicuous as in Cryptantha); Corolla, yellow/orange, ±tubular, 8 mm. × limb 1.5 mm.; Anthers (fill floral tube and are probably appressed to stigma); Ovary, deeply lobed, style base hidden within lobes; Nutlets, #3, erect, 3 mm. × 2.5 mm. × 1.5 mm., deltate, scar lateral, flat, without thick rim, surface cobblestone-like, margin prickles 0 (Described from Coll. No. 271, 24 April 2001, and Coll. No. 343, 20 April 2004).

- Winters Pass, Plants were found on stony-mantled ground on the small hill just north of the pass. Winters Pass is on Kingston Road where it passes through the Mesquite Mountains, 12.7 miles north of US Interstate 15 Exit 272 at Cima Road, then 5.7 miles north northwest on Kingston Road. Tom Schweich 343. 20 April 2004. ( CAS1202610^‡ OBI116647^‡ UC2045755^‡ ) . .

Cryptantha Lehm. ex G. Don.  Cryptantha. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Alongside the road, 2.15 mi (3.46 km) northeast of Winters Pass on Kingston Road, near the rock shelter and cattle guard, 69 km southwest of Las Vegas, Nevada. Tom Schweich 380. 22 April 2004. . .

Cryptantha pterocarya (Torr.) Greene var. cycloptera (Greene) J. F. Macbr.  Tucson Cryptantha. CalPhotos. Jepson eFlora. SEINet Taxon.

- Winters Pass, Nutlets: 4, all winged alike. Winters Pass is on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just west of the pass. Tom Schweich 347. 20 April 2004. ( CAS1202607^‡ OBI131894^‡ ) . .

Cryptantha utahensis (A. Gray) Greene.  Fragrant Forget-Me-Not. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, 18-25 cm., taller than wide, pustulate appressed hairy throughout; Leaves, cauline, alternate, sessile, 20 mm. × 3 mm. wide, margin entire; Inflorescence, not bracteate; Pedicel, 0 mm.; Calyx, rounded at base, 2.7 mm. × 1.7 mm. wide, 3 mm. in fruit, hairs straight (not hooked) throughout; Corolla, limb 2.6 mm., white; Nutlets, generally #1, ventral groove central, margin sharp but not flattened or wing-like, papillate with few small spines. Described from Coll. No. 1588, 18 April 2017. Keyed with Simpson & Hasenstab (2009).

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1588. 18 Apr 2017. ( COLO02348738^‡ CS EIU UC ) . .

Nama demissum A. Gray var. demissum.  Desert Purple Mat. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, sprawling, to 4 cm., green; Leaves, basal and cauline, sessile, oblanceolate, 11 mm. × 1.8 mm. wide; Calyx, lobes 5, equal, not cordate, sinus appendages 0, free from ovary; Corolla, 14 mm., limb 11 mm.; Ovary, entire; Styles, 2 (Described from Coll. No. 284, 24 April 2001).

- Mesquite Mountains, On cherry stem road west from Kingston Road, 1.3 m (2.1 km) north of Winters Pass, 71 km southwest of Las Vegas, NV. Tom Schweich 382. 22 April 2004. ( UC1953372^‡ ) . .

Pectocarya heterocarpa (I.M. Johnst.) I.M. Johnst.  Mixed-Nut Combseed. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, green / non-parasitic; Pedicel partly fused to one nutlet; Corolla white; Nutlets 4, spreading, paired, oblong, dissimilar, curved in 2 planes, margins dentate, of 1 pair narrow, of the other pair wide (Described from Coll. No. 336.1, 20 Apr 2012).

- Mesquite Mountains, Found in Coll. No. 445, of P. platycarpa. On a ridge east of Winters Pass, approximately 600 m from Kingston Road. Tom Schweich 445.1 20 Apr 2005. ( CAS1157697^‡ ) .

- Shadow Valley, In Creosote Bush scrub, on Kingston Road about 0.4 mi north of the intersection with Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 336.1 20 Apr 2004. ( UC2015288^‡ ) . .

Pectocarya platycarpa (Munz & I.M. Johnst.) Munz & I.M. Johnst.  Broad-Fruited Combseed. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, green / non-parasitic; Stem ascending; Pedicel free from nutlets; Corolla color unknown (should be white); Nutlets 4, spreading, paired, oblong, similar, straight, margins dentate, margin teeth width about equal length (Described from Coll. No. 336.2, 20 Apr 2012).

- Mesquite Mountains, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 69 km southwest of Las Vegas, Nevada. Tom Schweich 368. 22 April 2004. ( UC1953371^‡ ) Growing in gravel on southeast facing slope. On a ridge east of Winters Pass, approximately 600 m from Kingston Road. Tom Schweich 445. 20 April 2005. ( CAS1157698^‡ ) .

- Shadow Valley, In Creosote Bush scrub, on Kingston Road about 0.4 mi north of the intersection with Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 336.2 20 Apr 2004. ( UC2015287^‡ ) . .

Phacelia crenulata Torrey var. crenulata.  Cleftleaf Wildheliotrope. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Alongside the road, 1.7 mi (2.7 km) northeast of Winters Pass on Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 357. 20 April 2004. ( UC1953383^‡ ) On gravel bench or strath in limestone canyon, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road. Tom Schweich 362. 22 April 2004. ( UC1953384^‡ ) . .

Phacelia fremontii Torr.  Fremont's Phacelia. CalPhotos. Jepson eFlora. SEINet Taxon.

Green annual plant, single tap root, 10-20 cm., glandular, staining newsprint; Leaves mostly basal and few cauline, alternate, deeply pinnately-lobed, petioled; Inflorescence coiled; Calyx lobes equal, 5 mm x 1.5 mm wide, ob-linear (!), entire, tip rounded, only mid-rib raised, glandular, sinus appendages 0; Corolla deciduous in fruit, blue (?, small amount of color remaining in dried specimens, photo shows color); Petals fused 9 mm. + free 2 mm. = 11 mm.; Stamens, all attached at same level, included, different lengths (2,2,1), ±5 mm.; Filaments free, glabrous; Ovary obovoid, 4 mm, entire to not deeply-lobed, hairy distally; Style 1, attached to top of ovary, hairy proximally, 3-4 mm, 2-lobed, included; Seeds 8, 1.2 mm, nearly black, cross-furrowed (Described from TAS Coll. No. 273.1, 24 Apr 2011, Coll. #311, 25 May 2003, and #443, 27 March 2005). Compared to P. bicolor, the leaves of P. fremontii tend to be less compound and the tips more rounded, and the calyx lobes are more rounded.

- Mesquite Mountains, Growing in gravel on southeast facing slope. On the ridge east of Winters Pass, approximately 400 m from Kingston Road. Tom Schweich 443. 20 April 2005. ( CAS1131503^‡ UC2015327^‡ ) . .

Phacelia perityloides Coville var. jaegeri Munz.  Cliff Phacelia. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in a buff-colored limestone gravel. In saddle, 2.75 km east of Winters Pass. Tom Schweich 452. 21 April 2005. ( UC2015321^‡ ) . .

Phacelia vallis-mortae J. W. Voss.  Death Valley Phacelia. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 25 cm., tap-rooted; Stem strongly erect, 0-branched, glandular above middle; Leaves, alternate, petiole 7 mm., blade 22 mm., all deeply lobed to mid-rib, appearing compound, leaflets toothed, except distally; Pedicels in fruit 0.5 mm., stout (not thread-like); Calyx, 5 sepals, 5 mm. × 1 mm. wide, > fruit, elliptic (maybe) or oblanceolate; Corolla blue, deciduous; Style, 7 mm., divided 4.5 mm., exserted; Fruit, 3 mm., ovoid; Ovules, 1 per chamber, 4 per fruit, Seed, 2.5 mm., ovoid, pitted on both sides, ±ridged on adaxial side, but not grooved (Described from Coll. No. 355, 20 April 2004).

- Mesquite Mountains, At the end of a cherry-stem road into the North Mesquite Mountains Wilderness, 1.4 miles by road north of Winters Pass, then 1.6 miles by road west to end of road; about 21 miles by road north of the Cima Road exit on US Interstate 15. Tom Schweich 321. 27 May 2003. ( UC2015258^‡ UCR240677^‡ ) Alongside Kingston Road, near the rock shelter and cattle guard, 2.2 miles northeast of Winters Pass, and 6.3 miles southwest of the Nevada state boundary. Tom Schweich 355. 20 April 2004. ( UC ) Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1586. 18 Apr 2017. ( COLO02348712^‡ CS ) . .

Pholistoma membranaceum (Benth.) Constance.  White Fiestaflower. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 40 cm., sparsely prickly throughout; Stem, weak, tangled (reminiscent of a Galium); Leaf, alternate, petiole winged, 30 mm. × 30 mm. wide, tip rounded, most with 2 pinnate lobes ±= tip, some with 2nd pair of pinnate lobes; Inflorescence, open cyme; Calyx, lobes, #5, 1.5 mm. × 1 mm. wide; Corolla, petals #5, united at base 1.5 mm. + lobes 1.5 mm., white; Stamens, #5; Style, #1, 2-lobed distally; Fruit, 3 mm. × 3 mm. wide, sparsely prickly. (Described from Coll. No. 1587, 18 April 2017)

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1587. 18 Apr 2017. ( COLO02348720^‡ CS ) . .

Tiquilia canescens (DC.) A. T. Richardson var. canescens.  Woody Crinklemat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On top of a small hill, growing on dark limestone outcrops, 1.7 km east of Winters Pass. Tom Schweich 450. 20 April 2005. ( CAS1121732^‡ UC1973777^‡ ) .

Brassicaceae

Lepidium fremontii S. Watson.  Desert Pepperweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1579. 18 Apr 2017. ( COLO02348845^‡ CS EIU UC ) .

Cactaceae

Cylindropuntia acanthocarpa (Engelm. & J. M. Bigelow) F. M. Knuth.  (Syn: Opuntia acanthocarpa Engelm. & J. Bigelow ) Buckhorn Cholla. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Tom Schweich 229. 4/22/2004. . .

Ferocactus cylindraceus (Engelm.) Orc.  Barrel Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Tom Schweich 230. 4/22/2004. . .

Mammillaria tetrancistra Engelm.  Foxtail Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On the limestone outcrop, east side of mountains, north side of road. Tom Schweich 329. 4/20/2004. . .

Opuntia basilaris Engelm. & J. Bigelow var. basilaris.  Beavertail Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in gravel on limestone ridge. On the ridge east of Winters Pass, approximately 1000 m from Kingston Road. Tom Schweich 449. 20 April 2005. ( UC1953403^‡ ) .

Caryophyllaceae

Eremogone macradenia (S. Watson) Ikonn. var. macradenia.  (Syn: Arenaria macradenia S. Watson var. mcaradenia ) Desert Sandwort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, from woody rootstock, 20-30 cm.; Stem, 16-27 cm.; Leaves, opposite, ascending, 12-18 mm. × 1 mm. wide proximally to 6 mm. distally, needle-like, widest at base, tapered throughout length, congested bear base, stipules 0; Inflorescence, open cyme; Sepals, free, 4.2-7.8 mm. × 2.0-2.5 mm wide, tip acute (barely acuminate), folded tightly but not a spine; Petals, entire, claw 0; Styles, 3; Fruit, capsule, sutures 6 (Described from Coll. No. 189, 29 May 1999 and Coll. No. 1582, 18 Apr 2017).

- Mesquite Mountains, Northwest-facing dip slope on limestone, 2.64 mi (4.25 km) northeast of Winters Pass. Tom Schweich 372. 22 April 2004. ( UC1953364^‡ ) Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1582. 18 Apr 2017. ( COLO02348787^‡ CS EIU UC ) .

Celastraceae

Mortonia utahensis (Trel.) Nelson.  Utah Mortonia. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Alongside the road, 2.15 mi (3.46 km) northeast of Winters Pass on Kingston Road, near the rock shelter and cattle guard. Tom Schweich 353. 20 April 2004. ( UC1953398^‡ ) .

Chenopodiaceae

Grayia spinosa (Hook.) Moq.  Spiny Hop Sage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On northwest facing slopes, off Kingston Road 1.70 mi (2.75 km) north northeast of Winters Pass, 69 km southwest of Las Vegas, Nevada. Tom Schweich 374. 22 April 2004. ( UC1953421^‡ ) On northwest facing slopes, off Kingston Road 1.70 mi (2.75 km) north northeast of Winters Pass, 69 km southwest of Las Vegas, Nevada. Tom Schweich 375. 22 April 2004. . .

Krascheninnikovia lanata (Pursh) A. D. J. Meeuse & Smit.  (Syn: Diotis lanata Pursh , Eurotia lanata (Pursh) Moquin-Tandon ) Winter Fat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Northwest-facing dip slope on limestone, 2.64 mi (4.25 km) northeast of Winters Pass. Tom Schweich 370. 22 April 2004. ( UC1953361^‡ ) .

Euphorbiaceae

Chamaesyce albomarginata (Torrey & A. Gray) Small.  Rattlesnake Weed. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, tap-rooted, prostrate, to 7 cm. dia.; Leaves, opposite, ovate, 5 mm. × 4 mm. wide, margins entire, petioles 0.7 mm., stipules fused into wide membraneous scale; Inflorescence, 1 involucre per node, of separate ♂ and ♀ flowers; Involucre, glabrous, appendage white; Styles, #3, each divided ½; Fruit, glabrous (Described from Coll. No. 220, 27 Apr 2000).

- Mesquite Mountains, Along the old road east from Winters Pass to the saddle overlooking Mesquite Valley. Tom Schweich 337. 4/21/2005. .

Fabaceae

Dalea mollis Benth.  Hairy Prairie Clover. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual; Stem gland-dotted; Stipules present; Leaf pinnately compound; Leaflets 8-12, 5 mm. x 4 mm. wide, main axis ending as a leaflet, abaxially dark gland-dotted; Calyx 4-5 mm (Described from Coll. No. 350, 20 Apr 2004, small size of calyx and flatness of leaflets suggest D. mollis rather than D. mollissima).

- Mesquite Mountains, On disturbed ground, along Kingston Road, 3.6 mi (5.7 km) northeast of Winters Pass. Tom Schweich 350. 20 Apr 2004. ( UC2015285^‡ ) . .

Lupinus flavoculatus A. Heller.  Yellow Eyes. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual 3.5 - 5.5 cm.; Cotyledons sessile, persistent, disk-like; Leaves cauline, crowded near base, free blades of stipules 2 mm., palmate, sparse long hairy at flowering; Leaflet 8-9 mm.; Peduncle 11-22 mm.; Inflorescence 25-30 mm., not distinctly whorled, many-flowered; Pedicel 2 mm.; Calyx appendages 0; Banner blue-violet with prominent yellow spot, back glabrous; Wings; Keel glabrous (Described from Coll. No. 344, keyed 6 Dec 2012).

- Winters Pass, Winters Pass is on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just north of the pass. Tom Schweich 344. 20 April 2004. ( UC2015284^‡ ) . .

Psorothamnus fremontii (A. Gray) Barneby var. fremontii.  Fremont's Indigo Bush. CalPhotos. Jepson eFlora. SEINet Taxon.

Coll. No. 352, keyed 1 Dec 2012, characters observed: Perennial shrub, armed; Stems never puberulent (f), young stems strigose (f); Leaf mostly compound, 1-pinnate, persistent; Leaflets 5, 9 mm. x 2.5 mm. wide, gland-dotted, terminal continuous (a), lateral continuous when small, jointed when large (f); Calyx 5-6 mm sparsely hairy, lobes ± equal (a), > tube (?); Sepals fused 1/2 length; Flower bilateral; Corolla violet-purple; Banner outside wings; Fruit immature 5 mm. exserting, glands scattered (a), hairy along top and bottom edges and not sides (f). Some characters marked (a) argue for Psorothamnus arborescens while others marked (f) argue for P. fremontii (Described from Coll. No. 352, keyed 1 Dec 2012).

- Mesquite Mountains, On disturbed ground, along Kingston Road, 3.6 mi (5.7 km) northeast of Winters Pass. Tom Schweich 352. 20 April 2004. ( CAS1149290^‡ UC2015270^‡ UCR240678^‡ ) 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 366. 22 April 2004. .

Geraniaceae

Erodium cicutarium (L.) L'Her. ex Aiton.  Hemlock-leav'd Crane's-bill. Weed: CAL-IPC, List: Limited. CalPhotos. Jepson eFlora. SEINet Taxon.

- Winters Pass, Winters Pass is on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just north of the pass. Tom Schweich 349. 20 April 2004. ( UC2015280^‡ ) .

Krameriaceae

Krameria erecta Schultes.  Pima Rhatany. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 365. 22 April 2004. ( UC1953412^‡ ) .

Lamiaceae

Hedeoma nana (Torr.) Briq. ssp. californica W. S. Stewart.  California Mock Pennyroyal. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, woody at base, to 13 cm., (subshrub); Stem 4-angled, recurved short hairy throughout; Leaves opposite, petiole 1 mm. + blade 4.5 mm. × 2.5 mm. wide, ovate, short hairy, margin entire, abaxially glandular; Inflorescence axillary; Bract, 1 mm., hairy (not spiny); Pedicels 2 mm.; Calyx 4.5 mm., tubular, 3 lobes > other 2, in fruit, lobes variously curved but not converging, throat ±open; Corolla, 2-lipped, 7 mm.; (Style, should be unequally 2-lobed, but unable to see); Stamens 2, staminodes 0; Anthers, fertile sacs 2 (Described from Coll. No. 455, 21 April 2013).

- Mesquite Mountains, Among boulders in dark limestone, west-facing slope, near top of Mesquite Mountains. Tom Schweich 455. 21 April 2005. ( CAS1157556^‡ UC UCR248657^‡ ) . .

Salazaria mexicana Torrey.  Mexican Bladder Sage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Alongside the road, 1.7 mi (2.7 km) northeast of Winters Pass on Kingston Road, 70 km southwest of Las Vegas, Nevada. Tom Schweich 359. 20 April 2004. ( UC1953434^‡ UC1973775^† ) Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1585. 18 Apr 2017. ( COLO02348837^‡ CS EIU USCH0057542^‡ ) . .

0 records found in tblPhotographs for photo: images/salmex.gif

Salvia dorrii (Kellogg) Abrams var. pilosa (A. Gray) J. L. Strachan & Rev.  (Syn: Audibertia incana Benth. var. pilosa A. Gray , Ramona pilosa (A. Gray) Abrams , Salvia carnosa Douglas ex Greene var. pilosa (A.Gray) Epling ) Purple Sage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Alongside the road, 1.7 mi (2.7 km) northeast of Winters Pass on Kingston Road, 70 km southwest of Las Vegas, Nevada. Tom Schweich 358. 20 April 2004. ( CAS1121734^‡ UC1953390^‡ ) Near Kingston Road, 2.25 mi (3.62 km) north northeast of Winters Pass, 69 km southwest of Las Vegas, Nevada. Tom Schweich 376. 22 April 2004. ( UC1953389^‡ ) .

- Shadow Valley, Collected with Coll. No. 1578, Sphaeralcea ambigua Along Kingston Road, 17.2 miles north of US Interstate 15 on Kingston Road, and 4.6 miles northeast of the intersection of Kingston Road and Excelsior Mine Road. Tom Schweich 1577. 18 Apr 2017. ( CDA0050069^‡ COLO02348761^‡ CS EIU REGIS USCH0057372^‡ ) . .

Salvia mohavensis E. Greene.  Mohave Sage. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Northwest-facing dip slope on limestone, 2.64 mi (4.25 km) northeast of Winters Pass. Tom Schweich 373. 22 April 2004. ( UC1953391^‡ ) .

Loasaceae

Eucnide urens (A. Gray) C. Parry.  Rock Nettle. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On the limestone outcrop, east side of mountains, north side of road. Tom Schweich 330. 4/20/2004. . .

Mentzelia nitens Greene.  Shining Blazing Star. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1590. 18 Apr 2017. ( COLO02348746^‡ CS EIU029803^‡ UC ) .

Malvaceae

Sphaeralcea ambigua A. Gray.  Apricot Mallow. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 50 cm.; Hairs stellate; Leaves widely lanceolate, palmately veined, lobed but not deeply divided; Inflorescence panicle, dense in bud; Flower color apricot, fading to pink (Described from Coll. No. 424, keyed 8 Dec 2012).

- Mesquite Mountains, Near Kingston Road, 2.25 mi (3.62 km) north northeast of Winters Pass, 69 km southwest of Las Vegas, Nevada. Tom Schweich 378. 22 April 2004. ( UC1953399^‡ ) . .

Sphaeralcea ambigua A. Gray var. ambigua.  (Syn: Sphaeralcea ambigua A. Gray ssp. monticola Kearney ) Apricot Mallow. CalPhotos. Jepson eFlora. SEINet Taxon.

- Shadow Valley, Collected with Coll. No. 1577, Salvia dorrii. Along Kingston Road, 17.2 miles north of US Interstate 15 on Kingston Road, and 4.6 miles northeast of the intersection of Kingston Road and Excelsior Mine Road. Tom Schweich 1578. 18 Apr 2017. ( COLO CS EIU OBI124845^‡ ) .

Nyctaginaceae

Allionia incarnata L.  Windmills. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On gravel bench or strath in limestone canyon, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 361. 22 April 2004. ( UC1953362^‡ ) . .

Mirabilis laevis (Benth.) Curran var. villosa (Kellogg) Spellenb.  (Syn: M. bigelovii A. Gray var. bigelovii ) Wishbone Bush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 363. 22 April 2004. ( UC1953363^‡ ) .

Oleaceae

Menodora spinescens A. Gray.  Spiny Desert Olive. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in gravel on southeast facing slope. On the ridge east of Winters Pass, approximately 200 m from Kingston Road. Tom Schweich 441. 20 April 2005. ( UC1953381^‡ ) .

Onagraceae

Chylismia brevipes (A. Gray) Small ssp. brevipes.  (Syn: Camissonia brevipes (A. Gray) Raven ssp. brevipes ) Browneyes. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 364. 22 April 2004. ( UC1953404^‡ ) . .

Chylismia claviformis (Torr. & Frém.) A. A. Heller.  (Syn: Camissonia claviformis (Torr. & Frém.) P. H. Raven ) Browneyes. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 40-45 cm, day blooming; Stem 5 mm diameter, not wand-like, spreading hairs and few glandular hairs proximally, to glabrous distally; Stipules absent; Leaves mainly basal, pinnately lobed with large terminal lobe; Inflorescence from distal lobes; Sepals 11 mm, tips free in bud, remaining fused in pairs when flower opens, deciduous after flowering; Hypanthium 6.5 mm.; Petals 11 mm x 16 mm wide, yellow; Anthers 8; Ovary tip projection 0; Style 13 mm, exceeding anthers; Stigma 2 mm, ball-shaped, exserted; Fruit to 50 mm x 3.0-3.5 mm wide, wider toward the tip, 4-chambered, ? Row(s) per chamber; Seeds 2 mm x 1.2 mm wide, glabrous, not hair-tufted, ovate, flattened (Described from Coll. No. 447, keyed 11 Dec 2012, which keyed easily to Chylismia claviformis, but not to subspecies).

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. Very similar to my Coll. No. 447 (UCR241432) which has been determined Chylismia claviformis × brevipes. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1584. 18 Apr 2017. ( COLO CS ) . .

Chylismia claviformis × brevipes.  CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in gravel on limestone ridge. On the ridge east of Winters Pass, approximately 800 m from Kingston Road. Tom Schweich 447. 20 April 2005. ( UC2015324^‡ UCR241432^‡ ) .

Orobanchaceae

Castilleja chromosa A. Nelson.  Desert Indian Paintbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial subshrub, green, growing out of Artemisia tridentata, or in pinyon-juniper woodland, to 25-40 cm.; Hairs simple throughout; Leaves alternate, sessile, 30-50 mm. × 5 mm. wide, lanceolate to 5-lobed distally, not fleshy, short simple hairy; Inflorescence reddish, not glandular; Bract, 17 mm., 3- or 5-lobed; Calyx, 17-18 mm., divided equally 4-5 mm. (24-28%), lobes not curved upward; Corolla, tube 10-11 mm. + beak 10-13 mm. = 20-24 mm., straight, not curved through abaxial side of side of calyx sinus, upper lobes tip open, projected forward, lower lip small teeth, beak greenish yellow above and reddish below; Stamens, 4, fused in pairs; Anther, sacs per stamen obscured by twinning, looks like at least 3 sacs per pair of stamens; Stigma, lobes obscured by pollen (Described from Coll. No. 217, 27 April 2000 and Coll. No. 422, 26 May 2004).

- Mesquite Mountains, Near Kingston Road, 2.25 mi (3.62 km) north northeast of Winters Pass, 69 km southwest of Las Vegas, Nevada. Tom Schweich 377. 22 April 2004. ( CAS UC1973776^‡ ) . .

Orobanche cooperi (A. Gray) A. Heller.  (Syn: Aphyllon cooperi A. Gray ) Burro Weed Strangler. CalPhotos. Jepson eFlora. SEINet Taxon.

Non-photosynthetic parasitic herb to 12 cm.; Root attachment unknown; Inflorescence dense, 2.0-3.5 cm. wide; Pedicel 5 mm.; Bractlets, 2, 8 mm., narrow; Calyx, fused 5 mm. + free 6 mm. = 11 mm., divided ±equally; Corolla, 20 mm., constricted at middle, lacking a ring of hairs at base of filaments; Anthers, sparsely hairy; Stigma lobes 2, thin, recurved (Described from Coll. No. 456, 21 April 2005).

- Mesquite Mountains, Among boulders in dark limestone, west-facing slope, near top of Mesquite Mountains. Tom Schweich 456. 21 April 2005. ( CAS1157555^‡ UCR248658^‡ ) .

Phrymaceae

Diplacus bigelovii (A. Gray) G. L. Nesom var. bigelovii.  (Syn: Mimulus bigelovii (A. Gray) A. Gray var. bigelovii ) CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, About 1.75 mi northwest of Winters Pass, reached by going 1.2 mi north of Winters Pass on Kingston Road, then 1.5 mi west on cherry-stem road into North Mesquite Mountains Wilderness. Tom Schweich 319. 27 May 2003. ( CAS1157701^‡ UCR248655^‡ ) On cherry stem road west from Kingston Road, 1.3 m (2.1 km) north of Winters Pass. 71 km southwest of Las Vegas, Nevada. Tom Schweich 383. 22 April 2004. ( UC1953373^‡ ) .

Plantaginaceae

Penstemon palmeri A. Gray ssp. palmeri.  Wild Pink Snapdragon. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 367. 22 April 2004. ( UC1953376^‡ ) . .

Plantago ovata Forsskal.  Desert Indian-Wheat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 369. 22 April 2004. ( UC1953375^‡ ) .

Polemoniaceae

Gilia aliquanta A. D. Grant & V. E. Grant ssp. aliquanta.  Puff Calyx Gilia. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, from stout taproot, to 15 cm.; Leaves basal and cauline, Basal leaves, pinnate lobed, sharp pointed, hairs non-glandular; Cauline leaves, different, terminal leaflet > lateral leaflet; Pedicel 1-8 mm. (with open flowers); Calyx 2.5 mm., nearly glabrous, some purple color (faded), fused membraneous, puffed (hard to see on pressed surfaces, look on unpressed sides of calices); Stamens = corolla lobes; Seeds >1 per chamber, light brown (greenish), gelatinous when wet (Described from Coll. No. 451, keyed 11 Jan 2013).

- Mesquite Mountains, Growing in a buff-colored limestone gravel. In saddle, 2.75 km east of Winters Pass. Tom Schweich 451. 21 April 2005. ( CAS1149125^‡ UC2015322^‡ UCR241433^‡ ) . .

Gilia cana (M. E. Jones) A. Heller.  Desert Gilia, Showy Gilia. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual from stout tap root, green, photosynthetic; Leaves alternate, largest 1 cm. wide, oblanceolate, pinnate-divided; Inflorescence open, not coiled, not unrolling, parts in 5s; Pedicels 1-3 mm., axillary pedicels > calyx; Calyx lobes 5, 3 mm., tips pointed but not bristly, lobes fused by thin translucent membrane; Corolla tube (purple) 6 mm., + throat (yellow, wider near mouth) 3 mm. + lobes (5, equal, truncate acuminate) 5 mm = 14 mm.; Ovary 1, entire, style clearly attached to top; Stigmas 3; Stamens 5, alternate, = corolla lobes, all fertile; Filaments free, fused to corolla at base of lobes; Seeds not gelatinous when wet (per Aliciella) must have been gelatinous and I did not recognize it. (Described from Coll. No. 444, keyed 11 Jan 2013) .

- Mesquite Mountains, Growing in gravel on southeast facing slope. On the ridge east of Winters Pass, approximately 500 m from Kingston Road. Tom Schweich 444. 20 April 2005. ( CAS1149124^‡ UC2015326^‡ UCR241431^‡ ) . .

Langloisia setosissima (Cov.) S. Timbrook ssp. punctata.  Lilac Sunbonnet. CalPhotos. Jepson eFlora. SEINet Taxon.

- Winters Pass Hills, In open areas on a stony south-facing slope of the Winters Pass Hills, 16.2 mi (26.1 km) north of Valley Wells, 2.1 mi (3.4 km) south southwest of Winters Pass, 75 km southwest of Las Vegas, Nevada. Tom Schweich 341. 20 April 2004. ( CAS UC1953396^‡ ) . .

Linanthus demissus (A. Gray) E. Greene.  Desert Snow. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in gravel in open areas, common. On the ridge east of Winters Pass, approximately 100 m from Kingston Road. Tom Schweich 440. 20 April 2005. ( UC1953397^‡ ) .

Polygonaceae

Chorizanthe brevicornu Torr. var. brevicornu.  Brittle Spineflower. CalPhotos. Jepson eFlora. SEINet Taxon.

- Shadow Valley, In Creosote Bush scrub, just west of the Winters Pass Hills, on Kingston Road, about 0.4 mi north of its intersection with Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 340.1 20 April 2004. ( UC2015286^‡ ) . .

Chorizanthe rigida (Torrey) Torrey & A. Gray.  Spiny Herb. CalPhotos. Jepson eFlora. SEINet Taxon.

- Winters Pass, Winters Pass is on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just north of the pass. Tom Schweich 345. 20 April 2004. ( UC1953369^‡ ) . .

Eriogonum .  Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Winters Pass, Tom Schweich 385. 22 April 2004. . .

Eriogonum fasciculatum Benth. ssp. polifolium (A. DC.) Torrey & A. Gray.  California Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial shrub; Stem not jointed; Leaves narrowly oblanceolate, 10-15 mm., adaxially lightly tomentose, abaxially tomentose, margins rolled under; Inflorescence umbel-like; Involucres > 1 per node, hairy; Flower stipe absent; Perianth lobes alike, white to pink, soft hairy (Described from Coll. No. 332, 20 Apr 2004).

- Shadow Valley, In Creosote Bush scrub, on Kingston Road about 0.4 mi north of the intersection with Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 332. 20 April 2004. ( UC2015289^‡ UCR240672^‡ ) . .

Eriogonum inflatum Torrey & Fremont.  Desert Trumpet. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial occasionally flowering in first year, not glandular; Leaves basal only, round to obovate, to 20 mm, straight hairy both surfaces; Involucre peduncled, smooth, > 1.0 mm.; Flowers yellow, 1.5 mm., hairy (Described from Coll. No. 285.1, 12 Oct 2012).

- Mesquite Mountains, In Creosote Bush scrub, just west of the Winters Pass Hills, on Kingston Road about 5 miles north of Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 338. 20 April 2004. ( UC1953419^‡ ) . .

Eriogonum maculatum A. Heller.  Spotted Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in gravel on southeast facing slope. On the ridge east of Winters Pass, approximately 700 m from Kingston Road. Tom Schweich 446. 20 April 2005. ( UC2015325^‡ ) . .

Eriogonum nidularium Coville.  Birdnest Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual; Stem densely branched, some incurved, tomentose (not glabrous or glandular); Leaves basal, blades round-ovate; Involucre 1.5-2.0 mm., angled (a little), not solely at tips of slender branches, sessile, sparsely tomentose; Peduncles glabrous; Flowers 1.8-1.9 mm., yellow, glabrous, outer perianth lobes fan-shaped (fiddle-shaped?), obtuse basally, all lobes ± alike (Described from Coll. No. 320, 27 May 2003).

- Mesquite Mountains, About 1.75 mi northwest of Winters Pass, reached by going 1.2 mi north of Winters Pass on Kingston Road, then 1.5 mi west on cherry-stem road into North Mesquite Mountains Wilderness. Tom Schweich 320. 27 May 2003. ( UC2015260^‡ ) . .

Oxytheca perfoliata Torr. & A. Gray.  Round-Leaf Puncturebract. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual; Stem ocreae absent, glandular proximal 1/2 internode; Leaves basal, oblanceolate to 15 mm., entire; Involucre bell-shaped (not tubular per TJM2), bracts 4, fused at base, awns 4 2.0-2.5 mm.; Perianth hairy (Described from Coll. No. 346, 20 Apr 2004).

- Mesquite Mountains, Growing in gravel on limestone ridge. On the ridge east of Winters Pass, approximately 900 m from Kingston Road, 19 miles north of US I-15 near Valley Wells. Tom Schweich 448. 20 April 2005. ( UC2015323^‡ ) .

- Winters Pass, Winters Pass on Kingston Road where it passes through the Mesquite Mountains. Plants were found on stony-mantled ground on the small hill just west of the pass. Tom Schweich 346. 20 April 2004. ( UC2015283^‡ ) .

Ranunculaceae

Delphinium parishii A. Gray ssp. parishii A. Gray.  Parish's Larkspur. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On gravel bench or strath in a limestone canyon, 2.9 mi (4.6 km) northeast of Winters Pass on south side of Kingston Road, 68 km southwest of Las Vegas, Nevada. Tom Schweich 360. 22 April 2004. ( UC1953365^‡ ) .

Rosaceae

Coleogyne ramosissima Torrey.  Blackbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing in gravel on southeast facing slope. On the ridge east of Winters Pass, approximately 300 m from Kingston Road. Tom Schweich 442. 20 April 2005. ( UC1953415^‡ ) .

Rubiaceae

Galium stellatum Kellogg.  (Syn: G. s. Kellogg ssp. eremicum (Hilend & J. T. Howell) Ehrend. ) Starry Bedstraw. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 30 cm.; Stem, woody, 10 cm. or more; Leaves, whorls of 4, widest below middle, sharp at tip; Inflorescence, crowded; Corolla, 4-lobed; Fruit, 3.0-4.0 mm., incl. hairs, hairs dense, straight, white (Described from Coll. No. 454, 21 April 2005).

- Mesquite Mountains, Among boulders in dark limestone, west-facing slope, near top of Mesquite Mountains. Tom Schweich 454. 21 April 2005. ( CAS1157696^‡ UC UCR248640^‡ ) .

Santalaceae

Phoradendron californicum Nutt.  Desert Mistletoe. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Growing on Acacia greggii A. Gray. On cherry stem road west from Kingston Road, 1.3 m (2.1 km) north of Winters Pass, 71 km southeast of Las Vegas, Nevada. Tom Schweich 381. 22 April 2004. ( UC1953368^‡ ) .

Solanaceae

Lycium andersonii A. Gray.  Water Jacket. CalPhotos. Jepson eFlora. SEINet Taxon.

Woody perennial shrub, ±glabrous; Stem, branches straight; Leaf, ± linear to slightly obovate, petiole 1.5 mm + blade 5 mm × 1.5 mm wide; Calyx, cup-shaped, in fruit, ≤2 mm; Corolla lobes unknown; Seeds many (Described from Coll. No. 356, 20 Apr 2004).

- Mesquite Mountains, Alongside Kingston Road, near the rock shelter and cattle guard, 2.2 miles northeast of Winters Pass, and 6.3 miles southwest of the Nevada state boundary. Tom Schweich 356. 20 April 2004. ( UC ) . .

Lycium cooperi A. Gray.  Cooper's Box Thorn. CalPhotos. Jepson eFlora. SEINet Taxon.

Woody perennial to 1 m; Stem, branches straight, lateral becoming spines, thorns to 5 mm; Leaves, in alternate clusters, petiole 2 mm + blade 10 mm × 4.3 mm wide, obovate, flat in cross-section; Inflorescence, single flowers with leaf clusters; Pedicel 4 mm, short glandular hairy; Calyx, 7 mm, bell-shaped, lobes 5, short glandular hairy; Sepals, fused, 4.0 mm + lobes 3.0 mm = 7  mm, glandular hairy; Corolla tube 14 mm + lobes 3 mm = 17 mm, lobes reflexed; Fruit 4 mm (Described from Coll. No. 335, 20 April 2004).

- Mesquite Mountains, In Creosote Bush scrub, just west of the Winters Pass Hills, on Kingston Road, 0.4 miles northwest of intersection with Excelsior Mine Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 335. 20 April 2004. ( ? UCR248653^‡ ) . .

Nicotiana obtusifolia Martens & Galeotti.  Desert Tobacco. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb to 50 cm; Leaves, ±clasping (on the verge of sessile), definitely none petioled; Calyx, bell-shaped, sepals fused 8 mm + 5 lobes 6 mm × 8 mm dia., lobes equal; Corolla, 18-20 mm, limb 12 mm, open during day (Described from Coll. No. 453, 21 Apr 2013).

- Mesquite Mountains, On limestone outcrop, northwest side of Kingston Road, 3.6 mi (5.7 km) northeast of Winters Pass, 4.9 mi (7.9 km) from the Nevada state boundary. Tom Schweich 351. 20 April 2004. ( CAS1157585^‡ UCR248646^‡ ) In dark limestone boulders, on a steep, southeast-facing slope, near top of Mesquite Mountains, 2.9 km eastnortheast of Winters Pass. Tom Schweich 453. 21 April 2005. ( CAS1157557^‡ UC UCR248645^‡ ) . .

Physalis hederifolia A. Gray.  Ivy-Leaved Ground Cherry. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, On the limestone outcrop, east side of mountains, north side of road. Tom Schweich 331. 4/20/2004. .

Zygophyllaceae

Larrea tridentata (DC) Cov.  Creosote Bush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, In Creosote Bush scrub, just east of the Winters Pass Hills, on Kingston Road, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 334. 20 April 2004. ( UC1953411^‡ ) .

- Shadow Valley, Location of my collections 1569 to 1574. On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1570. 18 Apr 2017. ( COLO02348753^‡ CS EIU036410^‡ UC ) .

Agavaceae

Yucca brevifolia Engelm.  Joshua Tree. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Tom Schweich 226. 4/22/2004. . .

Yucca schidigera K. E. Ortgies.  Mohave Yucca. CalPhotos. Jepson eFlora. SEINet Taxon.

- Mesquite Mountains, Tom Schweich 225. 4/22/2004. .

- Shadow Valley, Also collected here, Coll. No. 1576, Ambrosia salsola. Along Kingston Road, 13.4 miles north of US Interstate 15 on Kingston Road, and 0.9 miles northeast of the intersection of Kingston Road and Excelsior Mine Road. Tom Schweich 1575. 18 Apr 2017. ( COLO02348829^‡ CS EIU UC ) .

Poaceae

Bromus madritensis L. ssp. rubens (L.) Husn.  (Syn: B. rubens L. ) Red Brome. Weed: CAL-IPC, List: High. Inyo National Forest, priority: Locally high; generally low, CalPhotos. Jepson eFlora. SEINet Taxon.

Annual grass, to 20-25 cm., soft hairy in many parts; Sheath (... looks open to me ...) Ligule, membraneous, 4 mm., laciniate; Inflorescence, panicle, 50 mm.; Spikelets, 1 per node, 27-40 mm., similar, axis mostly glabrous; Compression, lateral (looks strongly lateral to me, but this will send you down the wrong path); Glumes, lower, 7 mm., slightly keeled, few hairs, veins, 1, upper, 10 mm., rounded to keeled (IMHO), veins, 3(5); Florets, #4-6+; Lemma, 13 mm. × 2.3 mm. wide, veins, 3, tip, bifid, awns, #1, 9-11 mm., attached to back; Palea, 9 mm., margin sparsely ciliate; Grain, 8-9 mm. × 1.3 mm. wide, flattened, brown (Described from Coll. No. 1570.2, 18 April 2017 and Coll. No. 1589, 18 April 2017).

- Mesquite Mountains, Location of my collections Coll. No. 1579 to 1590. 19.6 miles north of US Interstate 15 on Kingston Road, then 1.1 miles west on an unnamed cherry stem road into the North Mesquite Mountains Wilderness (road is 1.3 miles north of Wilson Pass). Tom Schweich 1589. 18 Apr 2017. ( COLO02348886^‡ CS EIU036414^‡ UC ) .

- Shadow Valley, On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1570.2 18 Apr 2017. ( REGIS ) . .

Hilaria rigida (Thurb.) Scribn.  (Syn: Pleuraphis ridiga Thurber ) Big Galleta. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, mid-sized, to 30-60 cm., strongly tillered as plant axis lengthens, rhizomatous; Roots, stout; Stem, herbaceous; Internodes, fluted, solid, i.e., filled with pith, sparse soft long crinkly hairs (sparsely tomentose?); Leaf differentiated into sheath and blade, variously tomentose; Sheath open; Ligule membrane, 1 mm., divided into cilia at tip (laciniate?); Inflorescence well-developed, > leaves, spike-like, 8 cm., unbranched zig-zag central axis; Disarticulation, cluster of 3 spikelets falling as a unit; Spikelets, many, in clusters 3 per node, 1 central spikelet and 2 lateral spikelets on alternate sides of the rachis, hairy at base, sessile or nearly so, 8 mm.; Florets variously staminate or bisexual; Central spikelet: 1 bisexual floret, Glumes, 6 mm., ± equal, deeply 2-lobed, divided into 3-5 awn-like segments; Lemma 6 mm, ±glumes, membraneous, veins 3, prominent, glabrous, parallel, tip truncate, divided and ciliate, awns, 2 mm., straight, attached end; Lateral floret: 2 staminate florets, Lower glume 1+ awn-like segment; Upper glume awn 0; Anthers, 3.8 mm., lt. green with purple; Stigma: #2, feathery ciliate when present (Described from Coll. No. 337, 10 June 2012 and Coll. No. 1574, 18 April 2017)

- Mesquite Mountains, In Creosote Bush scrub on Kingston Road, 3 miles south of the Winters Pass Hills, 12 miles north of Valley Wells, climbing to Winters Pass in the Mesquite Mountains. Tom Schweich 337. 20 April 2004. ( UC2015356^‡ ) .

- Shadow Valley, Location of my collections 1569 to 1574. On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1574. 18 Apr 2017. ( COLO02348852^‡ CS EIU UC ) . .

Schismus barbatus (L.) Thell.  Mediterranean Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

- Shadow Valley, Location of my collections 1569 to 1574. On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1572. 18 Apr 2017. ( COLO02348860^‡ CS EIU036411^‡ UC ) . .

Stipa hymenoides Roem. & Schult.  (=Eriocoma hymenoides (Roem. & Schult.) Rydb.) Indian Rice Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, mid-sized, to 40 cm.; Internodes not swollen at base, filled with pith; Leaf blade and sheath differentiated, base not woody; Ligule membraneous; Inflorescence well developed, exceeds leaves; Spikelets not enclosed in bur-like involucre or subtended by bristles; Florets not modified into bulblets, 1 per spikelet, 6-7 mm.; Glume short hairy; Lemma hairy, overlapping in part, hardened at maturity, Awn 4 mm., decidiuous (Described from Coll. No. 425, 8 June 2012).

- Shadow Valley, On the now closed road to Kingston Wash, 12.6 miles north on Cima Road, Kingston Road, and then Excelsior Mine Road from the intersection of US Interstate 15 and Cima Road, then 0.4 miles west to the gate at the Kingston Range Wilderness. Tom Schweich 1570.1 18 Apr 2017. ( REGIS ) .

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

• Mesquite Mountains.
• Shadow Valley.
• Winters Pass.
• Winters Pass Hills.

Bibliography

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Date and time this article was prepared: 11/3/2024 7:03:20 PM.