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Ihsan A. Al-Shehbaz, except as noted

Annual to shrub; sap pungent, watery. Leaf: generally simple, alternate; generally both basal, cauline; stipules 0. Inflorescence: generally raceme, generally not bracted. Flower: bisexual, generally radial; sepals 4, generally free; petals (0)4, forming a cross, generally white or yellow to purple; stamens generally 6 (2 or 4), 4 long, 2 short (3 pairs of unequal length); ovary 1, superior, generally 2-chambered with septum connecting 2 parietal placentas; style 1, stigma entire or 2-lobed. Fruit: capsule, generally 2-valved, "silique" (length >= 3 × width) or "silicle" (length < 3 × width), dehiscent by 2 valves or indehiscent, cylindric or flat parallel or perpendicular to septum, segmented or not. Seed: 1–many, in 1 or 2 rows per chamber, winged or wingless; embryo strongly curved.
± 330 genera, 3780 species: worldwide, especially temperate. [Al-Shehbaz et al. 2006 Plant Syst Evol 259:89–120] Highest diversity in Mediterranean area, mountains of southwestern Asia, adjacent central Asia, western North America; some Brassica species are oil or vegetable crops; Arabidopsis thaliana used in experimental molecular biology; many species are ornamentals, weeds. Aurinia saxatilis (L.) Desvaux in cultivation only. Aubrieta occasional waif in central North Coast Ranges, Carrichtera annua (L.) DC. in South Coast, Iberis sempervirens L., Iberis umbellata L. in Peninsular Ranges, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern Outer North Coast Ranges, Central Coast. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Brassicaceae

Annual to perennial herb, generally ± glaucous; hairs simple or 0. Leaf: basal rosetted or not, petioled, entire or dentate to pinnately lobed or divided; cauline sessile, occasionally petioled, base generally lobed or clasping. Inflorescence: elongated. Flower: radial or bilateral; calyx urn- or occasionally bell-shaped, sepals erect, base ± sac-like, keeled or not; petal blade narrower to wider than proximal 1/2, generally channeled, margins ± crinkled or not; stamens in 3 pairs of unequal length, or 4 long and 2 short, longest filaments fused or free. Fruit: silique, dehiscent, linear, flat parallel to septum, unsegmented; stigma entire or 2-lobed. Seed: 10–120, in 1 row, generally winged.
35 species: southwestern United States, northern Mexico. (Greek: twisted flower, from wavy-margined petals)

Key to Streptanthus

Biennial or short-lived perennial herb, glabrous throughout. Stem: (0.5)1.5–12(15) dm, simple or many-branched at base, distally. Leaf: basal ± rosetted, early-deciduous, broadly ovate, obovate or oblong, entire to wavy or dentate distally; mid-cauline sessile, (0.7)1.5–6(9) cm, oblong to obovate or ± round, base lobed to clasping; distal round to oblong-ovate, clasping. Inflorescence: open to dense, 1-sided or not; bracted proximally or between most proximal 1–2 flowers; terminal sterile flower cluster 0. Flower: calyx urn-shaped, sepals 6–10(13) mm, keeled or not, ± purple, gray-green, or ± yellow, tips recurved; petals (6)8–14 mm, 1–2.5 mm wide, not crinkled, ± purple or ± yellow-white, veins generally purple; filaments free, in 3 pairs of unequal length, longest pair (5)7–11 mm; fertile anthers (1.5)2.5–4.5(6) mm. Fruit: recurved-spreading to pendent, (3)4–13(16) cm, 1.5–2.5(3) mm wide, occasionally constricted between seeds; valves glabrous, midvein obscure or ± distinct; stigma entire; pedicel spreading to ascending, (2)3–12(17) mm, expanded at receptacle. Seed: 26–76(110), 1.5–2.5 mm, broadly oblong to ovate or round; wing 0.1–0.5 mm wide at tip, continuous.
2n=28. Generally rocky to sandy soils, in open conifer forest, alpine areas, woodland; 200–4100 m. Klamath Ranges, North Coast Ranges, Cascade Range, Sierra Nevada, n San Francisco Bay Area, Outer South Coast Ranges; southwestern Oregon, Nevada. [Streptanthus tortuosus var. flavescens Jeps.; Streptanthus tortuosus var. orbiculatus (Greene) H.M. Hall; Streptanthus tortuosus var. suffrutescens (Greene) Jeps.; Streptanthus tortuosus var. oblongus Jeps.; Streptanthus tortuosus var. optatus Jeps.; Streptanthus tortuosus var. pallidus Jeps.; Streptanthus tortuosus var. tortuosus; Streptanthus tortuosus var. foliosus (Greene) D.W. Taylor] Highly variable, needs study. Apr–Sep [Online Interchange]

Previous taxon: Streptanthus polygaloides
Next taxon: Streptanthus vernalis


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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Streptanthus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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Geographic subdivisions indicated for the distribution of Streptanthus tortuosus Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.