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

San Diego jewelflower, San Diego wild cabbage, slender pod jewelflower

Habit Annuals; puberulent or glabrous (trichomes simple and subappressed, and 2-rayed). Annuals; hispid basally, glabrous or subglabrate distally.
Stems

erect to ascending (often flexuous, weak, often tangled with desert shrubs), usually branched distally, 1–8 dm, glabrous or puberulent.

erect, usually branched distally, 2.5–12 dm, hispid.

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).

weakly rosulate;

petiole 0.3–3 cm;

blade linear-oblanceolate to linear-oblong, 0.7–7 cm × 2–18 mm, margins coarsely dentate or pinnately lobed.

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).

(median) sessile;

blade linear-lanceolate, 5–16 cm × 5–40 mm, (smaller distally, base amplexicaul to sagittate), margins dentate or (distalmost) entire.

Racemes

(lax), without a terminal cluster of sterile flowers.

(densely flowered), 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.

sepals erect (purple or yellow to creamy white), lanceolate, 3–8 × 1–1.8 mm (equal);

petals purple or yellowish (often with darker purple veins), 5–15 mm, blade 2–6 × 1–1.5 mm, not crisped, claw narrowly oblanceolate or oblong, 3–9 × 1–1.5 mm;

filaments tetradynamous, median pairs 3–6 mm, lateral pair 2–5 mm;

anthers oblong, equal, 1–3 mm.

Fruiting pedicels

reflexed, 1–4.5 mm, usually glabrous, rarely puberulent.

reflexed, 2–8 mm, glabrous or hispid.

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.

reflexed (often straight, rarely curved), latiseptate or 4-angled, 4.5–10 cm × 1–1.5 mm;

valves each with prominent midvein;

ovules 56–82 per ovary;

style 0.5–3.5mm;

stigma slightly 2-lobed.

Seeds

1–2 × 1–1.2 mm.

1.2–2 × 0.9–1.4 mm.

2n

= 28.

= 28.

Caulanthus cooperi

Caulanthus heterophyllus

Phenology Flowering (Jan-)Feb–Mar. Flowering Mar–May.
Habitat Desert shrubs, woodlands Coastal scrub, chaparral, rocky areas
Elevation 600-2300 m (2000-7500 ft) 0-1400 m (0-4600 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; 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.)

Caulanthus heterophyllus is a common species distributed from Santa Barbara County southward into northwestern Baja California, Mexico.

R. E. Buck (1993) divided the species into two varieties, including one invalidly published, based on flower color, but these are treated here as mere color variants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 680. FNA vol. 7, p. 682.
Parent taxa Brassicaceae > tribe Thelypodieae > Caulanthus 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
C. amplexicaulis, C. anceps, C. barnebyi, C. californicus, C. cooperi, C. coulteri, C. crassicaulis, C. flavescens, C. glaucus, C. hallii, C. inflatus, C. lasiophyllus, C. lemmonii, C. major, C. pilosus, C. simulans
Synonyms Thelypodium cooperi, Guillenia cooperi Streptanthus heterophyllus, C. stenocarpus, Guillenia heterophylla, Streptanthus repandus
Name authority (S. Watson) Payson: Ann. Missouri Bot. Gard. 9: 293. (1923) (Nuttall) Payson: Ann. Missouri Bot. Gard. 9: 298. (1923)
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