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Caulanthus cooperi (S. Watson) Payson  
Family: Brassicaceae
Cooper's wild cabbage, more...Cooper's wildcabbage
[Thelypodium cooperi S. Wats.]
Caulanthus cooperi image
Patrick Alexander
  • FNA
  • Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
Annuals; puberulent or gla-brous (trichomes simple and subappressed, and 2-rayed). Stems erect to ascending (often flexuous, weak, often tangled with desert shrubs), usually branched distally, 1-8 dm, glabrous or puberulent. Basal leaves rosulate; petiole 0.3-2.5 cm; blade oblanceolate to spatulate, 0.7-6 cm × 2-27 mm, margins usually coarsely dentate or somewhat pinnatifid, rarely entire, (surfaces glabrous). Cauline leaves (median) sessile; blade lanceolate or oblong, 1.5-7.5 cm × 5-20 mm (smaller distally, base amplexicaul to sagittate), margins dentate or entire, (surfaces glabrous). Racemes (lax), without a terminal cluster of sterile flowers. Fruiting pedicels reflexed, 1-4.5 mm, usually glabrous, rarely puberulent. Flowers: sepals erect, (purplish or yellow-green), narrowly lanceolate, 3-6.5 × 0.8-1.5 mm (equal); petals yellow-green to purplish (often with purple veins), 4.5-9 mm, blade 2-3 × 0.7-1.5 mm, not crisped, claw narrowly oblong-oblanceolate, 2.5-7 × 1-1.5 mm; filaments slightly tetradynamous, median pairs 2-4.5 mm, lateral pair 1.5-3.5 mm; anthers oblong, equal, 1.5-2 mm. Fruits usually reflexed, rarely divaricate (often subfalcate), terete, 2-6 cm × 1.5-2.5 mm; valves each with prominent midvein, (glabrous or puberulent); ovules 24-48 per ovary; style 0.2-2.7 mm; stigma slightly 2-lobed. Seeds 1-2 × 1-1.2 mm. 2n = 28. Flowering (Jan-)Feb-Mar. Desert shrubs, woodlands; 600-2300 m; Ariz., Calif., Nev., Utah; Mexico (Baja California). Caulanthus cooperi is distributed in the Colorado and Mojave deserts in western Arizona, central and southern California, southern Nevada, and southern Utah.

Caulanthus cooperi
Open Interactive Map
Caulanthus cooperi image
Gregory Gust
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Patrick Alexander
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Patrick Alexander
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Gregory Gust
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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