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FNA | Family List | FNA Vol. 7 | Brassicaceae | Streptanthus

10. Streptanthus carinatus C. Wright ex A. Gray, Smithsonian Contr. Knowl. 5(6): 11. 1853.

Disaccanthus carinatus (C. Wright ex A. Gray) Greene

Annuals or biennials; (glaucous), glabrous throughout. Stems branched basally and/or distally, (2.1-)3-6.5(-7.5) dm. Basal leaves rosulate; petiolate; blade pinnatifid or oblanceolate, 3.5-15(-30) cm, margins runcinate-pinnatifid, dentate, or entire. Cauline leaves: blade ovate to lanceolate, 2.5-14 cm × 4-55 mm, (smaller distally), base auriculate to amplexicaul, margins runcinate-pinnatifid, dentate, or entire (usually entire distally). Racemes ebracteate, (lax). Fruiting pedicels divaricate-ascending, (straight or curved upward), 7-22(-35) mm. Flowers: calyx urceolate or campanulate; sepals purple, or ochroleucous to yellowish, 8-11 mm, keeled; petals white (with purplish veins) or purple (with white margins, recurved), 14-18 mm, blade 5-8 × 1-1.5 mm, margins crisped, claw 9-12 mm, about as wide as blade; stamens in 3 unequal pairs; filaments (distinct): abaxial pair 6-10 mm, lateral pair 4-7 mm, adaxial pair (exserted), 9-12 mm; anthers (all) fertile, 4-5 mm; gynophore 0.5-2 mm. Fruits ascending, smooth, straight, strongly flattened, 3-8 cm × 4.5-6 mm; valves each with obscure midvein; replum straight; ovules 26-54 per ovary; style 0.5-2 mm; stigma strongly 2-lobed. Seeds orbicular, 3-5 mm diam.; wing 0.6-1.1 mm wide, continuous. 2n = 28.

Subspecies 2 (2 in the flora): sw United States, n Mexico.

1 Basal and proximal cauline leaf blades: margins runcinate-pinnatifid; sepals purple; petals purple with white margins.   10a Streptanthus carinatus subsp. carinatus
+ Basal and proximal cauline leaf blades: margins entire, dentate, or runcinate-pinnatifid; sepals ochroleucous to yellowish; petals white with purplish veins.   10b Streptanthus carinatus subsp. arizonicus

Lower Taxa


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