TREATMENT FROM THE JEPSON MANUAL (1993) |
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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 1many 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 80:686699; 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 12:1727]
Native D. breweri S. Watson
Perennial
Stems generally several from base, < 15 cm; hairs dense, stellate
Leaves: basal 515 mm, oblanceolate to obovate, generally whitened, hairs dense, stellate, main axis obscure (branches again branched); cauline 110, generally entire
Inflorescence < 30-flowered, elongate; lower pedicels generally < 3 mm, appressed, not bracted
Flower: petals 24 mm, white
Fruit 410 mm, ± lanceolate, generally twisted; hairs > 3-branched, stellate; style < 0.5 mm
Seeds < 35, 0.61 mm; wings 0
Ecology: Open, rocky areas, generally above timberline
Elevation: > 2500 m.
Bioregional distribution: High Cascade Range, High Sierra Nevada, n East of Sierra Nevada, White and Inyo Mountains
Distribution outside California: Nevada
Flowering time: JulAug
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