Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Reed C. Rollins, except as specified

Annual to subshrub
Leaves generally basal and cauline, alternate, generally simple; stipules 0
Inflorescence: generally raceme
Flower bisexual; sepals 4, free; petals (0)4, free, generally white or yellow, often clawed; stamens generally (2,4)6, generally 4 long, 2 short; ovary 1, superior, chambers generally 2, septum membranous, connecting 2 parietal placentas, style 1, stigma simple or 2-lobed
Fruit: generally capsule ("silique") with 2 deciduous valves, sometimes breaking transversely or indehiscent
Seeds 1–many per chamber
Genera in family: 300+ genera, 3000+ species: worldwide, especially cool regions; some cultivated for food (especially Brassica, Raphanus ) and ornamental
Recent taxonomic note: Recently treated to include Capparaceae [Rodman et al. 1993 Ann Missouri Bot Gard 80:686–699; Rollins 1993 Cruciferae of Continental North America. Stanford Univ Press]
Family description, key to genera by Robert A. Price.


Species in genus: 1 sp
Etymology: (Greek: different Draba )


H. unilateralis (M.E. Jones) Greene

Stem hairy; branches few, near base, prostrate to ascending, 1–4 dm
Leaves basal and cauline, 1–2 cm, widely oblanceolate to obovate, entire to sparsely dentate; hairs dense, minute, multibranched; cauline generally near base
Inflorescence terminal, 1-sided, open; bracts 0
Flower inconspicuous; sepals purplish; petals white; stamens 6
Fruit widely separated, 3–5 mm, flat parallel to septum, widely ovate, often twisted; hairs dense, 0 above or not; pedicel recurved, 1–2 mm; style < 0.2 mm
Seeds 6–12, 1.2–1.5 mm, plump, oblong; wing 0; embryonic root at edges of both cotyledons
Ecology: Uncommon. Grassy, open slopes, flats, clay soils
Elevation: < 800 m.
Bioregional distribution: Cascade Range Foothills, s Sierra Nevada Foothills, Tehachapi Mountain Area, Great Central Valley, South Coast Ranges
Distribution outside California: Oregon, Mexico

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