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Las Vegas tumblemustard

Habit Annuals; (often glaucous), glabrous throughout.
Stems

unbranched or branched distally, 3–10 dm.

Basal leaves

(soon withered);

not rosulate;

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

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.

Racemes

lax.

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.

Fruiting pedicels

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

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.

Seeds

1–1.5 × 0.7–0.9 mm.

2n

= 20.

Thelypodiopsis vaseyi

Phenology Flowering Jul–Aug.
Habitat Open wooded slopes, mixed coniferous forests, canyons
Elevation 1900-2500 m (6200-8200 ft)
Distribution
from FNA
NM; TX
[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.
Parent taxa Brassicaceae > tribe Thelypodieae > Thelypodiopsis
Sibling taxa
T. ambigua, T. aurea, T. divaricata, T. elegans, T. juniperorum, T. purpusii, T. shinnersii, T. vermicularis
Synonyms Sisymbrium vaseyi
Name authority (S. Watson ex B. L. Robinson) Rollins: Contr. Gray Herb. 206: 12. (1976)
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