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Cooper caulanthus, Cooper's jewel-flower, Cooper's wild cabbage

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

Phenology Flowering (Jan-)Feb–Mar.
Habitat Desert shrubs, woodlands
Elevation 600-2300 m (2000-7500 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
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
C. amplexicaulis, C. anceps, C. barnebyi, C. californicus, C. coulteri, C. crassicaulis, C. flavescens, C. glaucus, C. hallii, C. heterophyllus, C. inflatus, C. lasiophyllus, C. lemmonii, C. major, C. pilosus, C. simulans
Synonyms Thelypodium cooperi, Guillenia cooperi
Name authority (S. Watson) Payson: Ann. Missouri Bot. Gard. 9: 293. (1923)
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