Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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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]

Introduced

D. nemorosa L.

Annual (may germinate in winter); herbage hairs stiff, simple, forked, and stellate
Stems 1–few from base, 3–30 cm, branched or not
Leaves: basal 10–30 mm, widely lanceolate to obovate; cauline 0–7, generally dentate
Inflorescence 5–40-flowered; lowest pedicel > 2 X fruit
Flower: petals ± 2–4 mm, light yellow, generally entire
Fruit 3–11 mm, narrowly oblong to obovate; hairs 0 or short, stiff, simple; style < 0.1 mm
Fruits becoming widely separated on elongate axis
Seeds 20–50, < 1 mm; wings 0
Chromosomes: 2n=16
Ecology: Uncommon. Open, disturbed area
Elevation: ± 2000 m.
Bioregional distribution: e Klamath Ranges (Siskiyou Co.)
Distribution outside California: circumboreal, probably waif in California

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