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clasping leaf caulanthus, claspingleaf wild cabbage

glaucous caulanthus, glaucous wild cabbage

Habit Annuals; glabrous throughout. Perennials; glabrous throughout.
Stems

erect, unbranched or branched distally, 0.4–11 dm.

erect or ascending, unbranched or branched distally, 3–12 dm.

Basal leaves

rosulate;

petiole 0.5–3 cm;

blade obovate to broadly oblanceolate, 1–7 cm × 5–37 mm, margins coarsely dentate.

not rosulate;

petiole 1–8 cm;

blade broadly obovate or oblong to elliptic, 2–10 cm × 20–120 mm, margins usually entire, rarely coarsely dentate-sinuate.

Cauline leaves

(median) sessile;

blade oblong to broadly ovate or obovate, 2–8 cm × 10–40 mm (smaller distally, base amplexicaul), margins coarsely dentate or entire.

(distalmost) shortly petiolate;

blade lanceolate to linear, 1–3.5 cm × 3–10 mm, margins entire.

Racemes

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

(densely flowered), without a terminal cluster of sterile flowers.

Flowers

sepals erect, (dark maroon-purple or ochroleucous to yellowish), ovate to ovate-lanceolate, 4–9.2 × 2–4 mm (equal);

petals (abaxial pair) usually stramineous to yellowish green, rarely pale purple, (adaxial pair) purple, (slightly longer), 10–18 mm, blade 4–10 × 0.5–1.5mm, crisped, claw narrowly oblong-oblanceolate, 6–10 × 1–3 mm;

filaments in 3 unequal pairs, abaxial pair 3–7 mm, lateral pair 1–5 mm, adaxial pair 4.5–9 mm;

anthers oblong, unequal, 1–3.5 mm (adaxial pair smaller).

sepals erect, (purplish or green to yellowish green), lanceolate, 7–12 × 2–3 mm (equal);

petals purple or yellowish green, (not or faintly veined),11–17.5 mm, blade 3–6 × 1.8–2.7 mm, not crisped, claw narrowly oblong to narrowly oblanceolate, 8–12 × 3–4 mm;

filaments tetradynamous, median pairs 3.5–8 mm, lateral pair 2–7 mm;

anthers narrowly oblong, equal, 3.5–4.5 mm.

Fruiting pedicels

divaricate to ascending, 2.5–19 mm.

ascending, 5–35 mm.

Fruits

divaricate to ascending (often distinctly curved), terete or slightly latiseptate, 4.5–14(–16.7) cm × 1–1.5 mm;

valves each with obscure midvein;

ovules 40–92 per ovary;

style 0–0.4 mm;

stigma subentire.

divaricate to ascending (often distinctly curved), terete, 4.5–15.5 cm × 1–1.6 mm;

valves obscurely veined;

ovules 180–210 per ovary;

style 0.2–1 mm;

stigma strongly 2-lobed (lobes 0.9–1.5 mm, connivent, opposite replum).

Seeds

1.4–2.2 × 0.9–1.2 mm.

1–2 × 0.8–1.2 mm.

2n

= 28.

= 20.

Caulanthus amplexicaulis

Caulanthus glaucus

Phenology Flowering Apr–Jul(-Aug). Flowering Apr–Jun.
Habitat Chaparral, montane forests, serpentine areas, granitic and shale scree Sagebrush scrub, dry slopes and rocky outcrops
Elevation 800-2900 m (2600-9500 ft) 1500-2400 m (4900-7900 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[BONAP county map]
Discussion

Caulanthus amplexicaulis is known from Los Angeles, San Bernardino, Santa Barbara, and Ventura counties. The serpentine populations of Santa Barbara County have sepals that are ochroleucous to yellowish instead of the dark maroon ones found elsewhere in the species range. They were recognized by R. C. Rollins (1993) and R. E. Buck (1995) as var. barbarae. Both vars. barbarae and amplexicaulis form a distinct monophyletic clade but they are without reproductive barriers (A. E. Pepper and L. E. Norwood 2001). Some other species of Caulanthus show comparable or even greater variation in sepal color, and it might be more practical to treat var. barbarae as a color form.

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

Of conservation concern.

Caulanthus glaucus is known in California from Inyo and Mono counties and in Nevada from Esmeralda, Mineral, and Nye counties.

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

Source FNA vol. 7, p. 679. FNA vol. 7, p. 682.
Parent taxa Brassicaceae > tribe Thelypodieae > Caulanthus Brassicaceae > tribe Thelypodieae > Caulanthus
Sibling taxa
C. anceps, C. barnebyi, C. californicus, C. cooperi, 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. hallii, C. heterophyllus, C. inflatus, C. lasiophyllus, C. lemmonii, C. major, C. pilosus, C. simulans
Synonyms C. amplexicaulis var. barbarae, Euklisia amplexicaulis, Pleiocardia magna, Streptanthus amplexicaulis, Streptanthus amplexicaulis var. barbarae Streptanthus glaucus
Name authority S. Watson: Proc. Amer. Acad. Arts 17: 364. (1882) S. Watson: Proc. Amer. Acad. Arts 17: 364. (1882)
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