Caulanthus cooperi |
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Cooper caulanthus, Cooper's jewel-flower, Cooper's wild cabbage |
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Habit | Annuals; puberulent or glabrous (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. |
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. |
Fruiting pedicels | reflexed, 1–4.5 mm, usually glabrous, rarely puberulent. |
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. |
Caulanthus cooperi |
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Phenology | Flowering (Jan-)Feb–Mar. |
Habitat | Desert shrubs, woodlands |
Elevation | 600-2300 m (2000-7500 ft) |
Distribution |
AZ; CA; NV; UT; Mexico (Baja California)
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Discussion | Caulanthus cooperi is distributed in the Colorado and Mojave deserts in western Arizona, central and southern California, southern Nevada, and southern Utah. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 680. |
Parent taxa | Brassicaceae > tribe Thelypodieae > Caulanthus |
Sibling taxa | |
Synonyms | Thelypodium cooperi, Guillenia cooperi |
Name authority | (S. Watson) Payson: Ann. Missouri Bot. Gard. 9: 293. (1923) |
Web links |