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Las Vegas tumblemustard

Westwater tumble-mustard

Habit Annuals; (often glaucous), glabrous throughout. Annuals or biennials; pilose throughout or at least basally.
Stems

unbranched or branched distally, 3–10 dm.

branched basally and distally, 1.5–8.5(–12) dm, (sparsely to densely pilose basally or throughout, trichomes crisped).

Basal leaves

(soon withered);

not rosulate;

blade oblong to lanceolate or oblanceolate, 3–6 cm × 5–15 mm, margins usually entire, rarely denticulate.

(soon withered); rosulate;

petiole 0.5–2.5(–5) cm;

blade oblanceolate, 1–5.8 cm × 5–22 mm, margins entire or dentate, (surfaces glabrous or pilose abaxially).

Cauline leaves

sessile;

blade (proximalmost) oblong to lanceolate or oblanceolate, or (distal) linear to narrowly oblong or lanceolate, base auriculate, margins usually entire, rarely denticulate.

sessile;

blade ovate to oblong, base auriculate, margins usually entire, rarely dentate, (surfaces glabrous or pilose abaxially).

Racemes

lax.

dense.

Flowers

sepals spreading, whitish or purplish, 1.8–2.5 × 0.7–1 mm;

petals white, obovate to spatulate, 2.5–4.5 × 1.7–2.5 mm, claw 1–1.5 mm;

median filament pairs 1.7–2.5 mm;

anthers ovate, 0.5–0.8 mm;

gynophore 0.2–0.4 mm.

sepals usually erect to ascending, rarely spreading, purplish to lavender or whitish, 4–7 × 1.2–2 mm;

petals pale purple to white, spatulate, 7.5–14 × 3–5 mm, (margins not crisped), claw 4–8 mm;

median filament pairs 4–8 mm;

anthers linear, 2.5–4 mm;

gynophore (stout), 0.3–1.5 mm.

Fruiting pedicels

horizontal to divaricate, straight or slightly recurved, (slender), 7–15 mm.

divaricate, straight or slightly upcurved, (3.5–)5–16 mm, (glabrous or sparsely pilose).

Fruits

erect to ascending, straight or curved, strongly torulose, 1.5–2.5 cm × 1–1.2 mm;

ovules 20–32 per ovary;

style cylindrical, 0.5–0.8 mm;

stigma obscurely 2-lobed.

divaricate-ascending to spreading, straight or curved, torulose, 4–8(–9) cm × 1.2–1.5 mm; (valves glabrous or pilose);

ovules 46–94 per ovary;

style often clavate, 1–3 mm;

stigma strongly 2-lobed.

Seeds

1–1.5 × 0.7–0.9 mm.

1.2–1.5 × 0.8–1 mm.

2n

= 20.

Thelypodiopsis vaseyi

Thelypodiopsis elegans

Phenology Flowering Jul–Aug. Flowering Apr–Jun.
Habitat Open wooded slopes, mixed coniferous forests, canyons Shale grounds, loose gypsum, barren areas, clay banks of rocky hillsides, shrub communities
Elevation 1900-2500 m (6200-8200 ft) 1400-2400 m (4600-7900 ft)
Distribution
from FNA
NM; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Thelypodiopsis vaseyi is known from Lincoln, Otero, and San Miguel counties in New Mexico and Culberson County in Texas. R. C. Rollins (1982b, 1993) did not record it from Texas; the first report from there is based on Johnston 3148 (MO), collected in Guadalupe Mountains. Sisymbrium watsonii Payson is an illegitimate name that pertains to S. vaseyi.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 727. FNA vol. 7, p. 726.
Parent taxa Brassicaceae > tribe Thelypodieae > Thelypodiopsis Brassicaceae > tribe Thelypodieae > Thelypodiopsis
Sibling taxa
T. ambigua, T. aurea, T. divaricata, T. elegans, T. juniperorum, T. purpusii, T. shinnersii, T. vermicularis
T. ambigua, T. aurea, T. divaricata, T. juniperorum, T. purpusii, T. shinnersii, T. vaseyi, T. vermicularis
Synonyms Sisymbrium vaseyi Thelypodium elegans, Sisymbrium elegans, Streptanthus wyomingensis, T. bakeri, T. wyomingensis, Thelypodium bakeri
Name authority (S. Watson ex B. L. Robinson) Rollins: Contr. Gray Herb. 206: 12. (1976) (M. E. Jones) Rydberg: Bull. Torrey Bot. Club 34: 432. (1907)
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