Caulanthus cooperi |
Brassicaceae tribe Thelypodieae |
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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). | Annuals, biennials, perennials, shrubs, or subshrubs; eglandular. |
Stems | erect to ascending (often flexuous, weak, often tangled with desert shrubs), usually branched distally, 1–8 dm, glabrous or puberulent. |
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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). |
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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). |
petiolate or sessile; blade base auriculate or not, margins entire, dentate, or pinnately lobed. |
Racemes | (lax), without a terminal cluster of sterile flowers. |
usually ebracteate, often elongated in fruit. |
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. |
usually actinomorphic, rarely zygomorphic; sepals erect, ascending, spreading, or reflexed, lateral pair saccate or not basally; petals white, yellow, orange, pink, lilac, lavender, purple, green, brown, or nearly black, claw present, often distinct; filaments unappendaged, not winged; pollen 3-colpate. |
Fruiting pedicels | reflexed, 1–4.5 mm, usually glabrous, rarely puberulent. |
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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. |
usually siliques, rarely silicles, usually dehiscent, unsegmented, usually terete, 4-angled, or latiseptate; ovules 1–210[–numerous] per ovary; style obsolete, distinct, or absent; stigma usually entire or 2-lobed (subentire in Sibaropsis, Streptanthella). |
Seeds | 1–2 × 1–1.2 mm. |
usually biseriate or uniseriate, rarely aseriate; cotyledons accumbent or incumbent. |
Trichomes | usually simple, rarely forked or dendritic [subdendritic], sometimes absent. |
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2n | = 28. |
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Caulanthus cooperi |
Brassicaceae tribe Thelypodieae |
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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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North America; Mexico; Central America; South America |
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.) |
Genera 27, species ca. 215 (14 genera, 105 species in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 680. | FNA vol. 7, p. 676. |
Parent taxa | Brassicaceae > tribe Thelypodieae > Caulanthus | Brassicaceae |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Thelypodium cooperi, Guillenia cooperi | |
Name authority | (S. Watson) Payson: Ann. Missouri Bot. Gard. 9: 293. (1923) | Prantl: in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 55[III,2]: 155. (1891) |
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