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©Copyright 1993 by the Regents of the University of California

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

BRASSICACEAE

MUSTARD FAMILY

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.

DRABA

Robert A. Price

Annual to perennial herb, often cushion- or mat-forming; hairs often branched
Leaves basal and sometimes cauline, entire or shallowly toothed
Flower: sepal bases equal; petals < 10 mm, yellow or white, claw and limb generally distinct
Fruit < 30 mm, generally lanceolate to ovate, generally flat parallel to septum, less often partially inflated, sometimes twisted or wavy
Seeds: 2 rows per chamber; wing generally 0
Species in genus: 350+ species: n hemisphere, mtns of South America
Etymology: (Greek: acrid)
Reference: [Rollins & Price 1988 Aliso 12:17–27]

Native

D. corrugata S. Watson

Biennial to perennial herb
Stems 1–several from base, < 25 cm; hairs coarse, simple and forked
Leaves: hairs coarse, simple and forked; basal in dense cushion-like rosettes, 10–30 mm, oblanceolate, entire, grayish; cauline 0–15
Inflorescence 10–100+-flowered
Flower: petals 3–5 mm, yellow
Fruit 5–20 mm, (1.5)2–3(4) mm wide, elliptic, generally twisted; tip acute; hairs 0 or simple, forked, and stellate; style 1.5–3.5 mm
Seeds < 35, 1.2–1.6 mm; wings 0
Ecology: Slopes among rocks
Elevation: 2000–3800 m.
Bioregional distribution: San Gabriel Mountains, San Bernardino Mountains, Peninsular Ranges
Distribution outside California: Baja California

Native

var. corrugata


Stem branched
Leaves: cauline 3–15, often crowded
Fruits densely clustered
Ecology: Habitats and elevations of sp.
Bioregional distribution: San Gabriel Mountains, San Bernardino Mountains. Plants with fruits more finely, densely hairy have been called forma vestita (Davidson) C.L. Hitchc.

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