Thelypodiopsis aurea |
Thelypodiopsis divaricata |
|
---|---|---|
Durango tumblemustard |
spreading thelypodiopsis |
|
Habit | Annuals or perennials; (short-lived); (glaucous), glabrous or sparsely pubescent basally. | Annuals or biennials; pubescent proximally, glabrate distally. |
Stems | branched basally and distally, (1.4–)2–5(–6) dm, (glabrous or sparsely pubescent basally). |
usually branched distally, rarely unbranched, 2–8.5(–10) dm, (often densely pubescent proximally, trichomes flat, crisped). |
Basal leaves | rosulate; petiole 0.5–4 cm; blade oblanceolate, 2–7 cm × 5–22 mm, margins irregularly dentate. |
(soon withered); not rosulate; blade oblong, 2–10 cm × 10–30 mm, margins entire or dentate, (surfaces glabrous or sparsely pubescent). |
Cauline leaves | sessile; blade lanceolate to oblong, (smaller distally), base auriculate, margins entire, (surfaces glabrous). |
sessile; blade (proximalmost) oblong or (distal) oblong to ovate, base auriculate to amplexicaul, margins usually entire or dentate (rarely dentate distally). |
Racemes | dense. |
dense. |
Flowers | sepals spreading to reflexed, yellow, 5–7.5(–8.5) × 1.7–2.5 mm; petals yellow, spatulate to broadly oblong, 7–11(–13) × 2–3.5 mm, claw 5–7 mm (to 2 mm wide); median filament pairs 5–6.5 mm; anthers linear, 3–4 mm; gynophore (slender), 2–6(–8) mm. |
sepals (calyx often urceolate), erect, yellowish, 3.5–5.5 × 1.5–2 mm, (sparsely pubescent); petals yellow, oblong, 6.5–9(–10) × 1–1.7 mm, (margins crisped), claw 3.5–5 mm (to 2 mm wide); median filament pairs 4–5 mm; anthers linear, 2.5–3.5 mm; gynophore (stout), 0.5–1.5 mm. |
Fruiting pedicels | divaricate-ascending, straight, (5–)6.6–13(–15) mm. |
divaricate-ascending to spreading, straight, (slender), 6.5–14(–21) mm, (glabrous or pubescent). |
Fruits | erect to divaricate-ascending, straight or slightly curved, torulose, 5–7.5(–9) cm × 1.2–1.7 mm; ovules 72–98 per ovary; style subclavate, 0.5–2 mm; stigma 2-lobed. |
suberect to divaricate-ascending or spreading, straight, slightly torulose, 4–8(–9.5) cm × 1.2–1.7 mm; (valves sparsely pubescent at least when immature); ovules 70–94 per ovary; style subclavate, 0.7–2 mm; stigma 2-lobed. |
Seeds | 1.2–1.5 × 0.6–0.8 mm. |
1–1.7 × 0.7–1 mm. |
2n | = 22. |
= 22. |
Thelypodiopsis aurea |
Thelypodiopsis divaricata |
|
Phenology | Flowering Apr–May. | Flowering Apr–Jun. |
Habitat | Shrub communities on clay or, rarely, sandy soil | Rocky knolls, sandy or clay grounds in juniper and shrub communities |
Elevation | 1200-2200 m (3900-7200 ft) | 1200-2100 m (3900-6900 ft) |
Distribution |
CO; NM; UT
|
UT |
Discussion | Thelypodiopsis aurea is restricted to the Four Corners area and is known only from Montezuma County in Colorado, Sandoval and San Juan counties in New Mexico, and San Juan County in Utah. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Thelypodiopsis divaricata is known from Carbon, Emery, Garfield, Grand, Kane, San Juan, and Wayne counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 725. | FNA vol. 7, p. 725. |
Parent taxa | Brassicaceae > tribe Thelypodieae > Thelypodiopsis | Brassicaceae > tribe Thelypodieae > Thelypodiopsis |
Sibling taxa | ||
Synonyms | Thelypodium aureum, Sisymbrium aureum | Caulanthus divaricatus |
Name authority | (Eastwood) Rydberg: Bull. Torrey Bot. Club 34: 432. (1907) | (Rollins) S. L. Welsh & Reveal: Great Basin Naturalist 37: 355. (1978) |
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