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. paysonii J.F. Macbr. var. treleasei (O.E. Schulz) C.L. Hitchc.
Perennial
Stems cushion-forming, < 6 cm; hairs tangled, simple and forked
Leaves basal, 48 mm, ± linear, entire; midrib prominent on lower surface; hairs on lower surface long, forked and cross-shaped; margin hairs prominent, stiff, simple and forked
Inflorescence < 10-flowered
Flower: petals 35 mm, yellow
Fruit 38 mm, ± ovate; hairs simple, forked, and stellate; style 0.41 mm
Seeds < 10, 1.31.8 mm
Chromosomes: 2n=42
Ecology: Uncommon. Open, rocky slopes
Elevation: > 2000 m.
Bioregional distribution: n High Sierra Nevada
Distribution outside California: nw US, w Canada
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