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spindlestem, thick stem caulanthus, thick-stem wild cabbage

Habit Perennials; glabrous or sparsely pubescent.
Stems

erect or ascending, usually unbranched, rarely branched, (hollow, strongly inflated, fusiform, to 3 cm diam. at widest point), 2–10 dm.

Basal leaves

rosulate;

petiole 0.5–9 cm;

blade obovate to oblanceolate (in outline), 1–12 cm × 3–45 mm, margins entire, dentate-sinuate, lyrate, runcinate, or pinnatifid.

Cauline leaves

(distalmost) shortly petiolate;

blade linear to narrowly oblanceolate, margins entire.

Racemes

(densely flowered), with a terminal cluster of sterile flowers.

Flowers

sepals erect (creamy white, purplish, or greenish), ovate to lanceolate, 7.5–14 × 2.5–4 mm (equal);

petals brown or purple, 10–15 mm, blade 3–5 × 1.2–2.5 mm, not or hardly crisped, claw oblanceolate, 7–10 × 2–2.5 mm;

filaments tetradynamous, median pairs 3–8 mm, lateral pair 2–7 mm;

anthers narrowly oblong, equal, 3–6.5 mm.

Fruiting pedicels

ascending, 1–5 mm, glabrous or pubescent, (trichomes flattened).

Fruits

erect to ascending, terete or slightly latiseptate, 4.5–14 cm × 2–2.5 mm;

valves each with obscure midvein;

ovules 98–126 per ovary;

style obsolete or, rarely, to 0.6 mm;

stigma strongly 2-lobed (lobes to 1 mm, connivent, opposite valves).

Seeds

1.5–4 × 1.5–2 mm.

2n

= 28.

Caulanthus crassicaulis

Phenology Flowering Apr–Jul.
Habitat Sagebrush scrub, pinyon-juniper woodland
Elevation 1200-2900 m (3900-9500 ft)
Distribution
from FNA
AZ; CA; CO; ID; NV; UT; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

E. B. Payson (1923), R. C. Rollins (1993), and R. E. Buck (1995) recognized two varieties of Caulanthus crassicaulis and separated them solely on the basis of var. crassicaulis having pubescent sepals and glabrous or pubescent leaves, and var. glaber having glabrous or sparsely pubescent sepals and glabrous leaves. In my opinion, this distinction is impractical; as in some other species of Caulanthus, both glabrous and pubescent forms occur sometimes within the same population.

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

Source FNA vol. 7, p. 681.
Parent taxa Brassicaceae > tribe Thelypodieae > Caulanthus
Sibling taxa
C. amplexicaulis, C. anceps, C. barnebyi, C. californicus, C. cooperi, C. coulteri, C. flavescens, C. glaucus, C. hallii, C. heterophyllus, C. inflatus, C. lasiophyllus, C. lemmonii, C. major, C. pilosus, C. simulans
Synonyms Streptanthus crassicaulis, C. crassicaulis var. glaber, C. glaber, C. senilis
Name authority (Torrey) S. Watson: Botany (Fortieth Parallel), 27. (1871)
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