Thelypodiopsis vaseyi |
Thelypodiopsis |
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Las Vegas tumblemustard |
tumblemustard |
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Habit | Annuals; (often glaucous), glabrous throughout. | Annuals, biennials, or, rarely, perennials; not scapose; glabrous or pubescent. | ||||||||||||||||||||||||||||||||
Stems | unbranched or branched distally, 3–10 dm. |
(simple or few to several from base), erect [ascending, decumbent], branched basally and/or distally, (glabrous or pubescent). |
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Leaves | basal and cauline; petiolate or sessile; basal (soon caducous), rosulate or not, petiolate, blade margins entire or dentate; cauline sessile, blade (base auriculate, sagittate, or amplexicaul), margins entire or dentate. |
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Basal leaves | (soon withered); not rosulate; blade oblong to lanceolate or oblanceolate, 3–6 cm × 5–15 mm, margins usually entire, rarely denticulate. |
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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. |
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Racemes | lax. |
(corymbose, dense or lax), considerably [slightly] elongated in fruit. |
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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 (equal), usually erect, sometimes ascending or spreading, rarely reflexed, oblong, lateral pair not saccate basally; petals (erect basally), usually white, lavender, or purple, rarely yellow, oblanceolate, oblong, spatulate, or obovate, (margins rarely crisped), claws differentiated or not from blade, (apex rounded); stamens tetradynamous, (exserted); filaments distinct; anthers usually linear, sometimes ovate or oblong (apically coiled); nectar glands confluent, subtending bases of stamens. |
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Fruiting pedicels | horizontal to divaricate, straight or slightly recurved, (slender), 7–15 mm. |
erect to ascending or divaricate, slender. |
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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. |
stipitate, linear, torulose or smooth, terete; valves each with prominent midvein, usually glabrous, rarely pilose; replum rounded; septum complete; ovules 20–114 per ovary; style distinct, (cylindrical or subclavate to clavate); stigma capitate, usually strongly 2-lobed, rarely entire, (lobes opposite replum). |
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Seeds | 1–1.5 × 0.7–0.9 mm. |
uniseriate, plump, not winged, oblong; seed coat (minutely reticulate), not mucilaginous when wetted; cotyledons incumbent or obliquely so. |
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x | = 10, 11. |
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2n | = 20. |
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Thelypodiopsis vaseyi |
Thelypodiopsis |
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Phenology | Flowering Jul–Aug. | |||||||||||||||||||||||||||||||||
Habitat | Open wooded slopes, mixed coniferous forests, canyons | |||||||||||||||||||||||||||||||||
Elevation | 1900-2500 m (6200-8200 ft) | |||||||||||||||||||||||||||||||||
Distribution |
NM; TX
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w United States; n Mexico |
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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.) |
Species 10 (9 in the flora). As recognized by R. C. Rollins (1982b, 1993), Thelypodiopsis was artificially delimited, and no single characteristic or combination of characteristics reliably distinguished it from related genera. Rollins’s circumscription was so broad that it included species of Dryopetalon and Romanschulzia O. E. Schulz. Of the nine species of Thelypodiopsis that occur in the flora area, three (T. purpusii, T. shinnersii, and T. vaseyi) are quite anomalous and, together with the Mexican T. versicolor (Brandegee) Rollins (Coahuila, San Luis Potosí), eventually may be excluded from the genus. Unlike the other six species, these three have entire or obscurely (versus prominently) 2-lobed stigmas, oblong or ovate anthers 0.5–1 mm (versus linear and 2.5–4 mm), and petal claws obscurely (versus strongly) differentiated from blades. They are here retained in the genus only tentatively and currently are being subjected to detailed molecular and morphological studies, along with Mexican, Central American, and South American taxa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 7, p. 727. | FNA vol. 7, p. 723. | ||||||||||||||||||||||||||||||||
Parent taxa | Brassicaceae > tribe Thelypodieae > Thelypodiopsis | Brassicaceae > tribe Thelypodieae | ||||||||||||||||||||||||||||||||
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Synonyms | Sisymbrium vaseyi | |||||||||||||||||||||||||||||||||
Name authority | (S. Watson ex B. L. Robinson) Rollins: Contr. Gray Herb. 206: 12. (1976) | Rydberg: Bull. Torrey Bot. Club 34: 432. (1907) | ||||||||||||||||||||||||||||||||
Web links |