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

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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.


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]


D. cana Rydb.


Stems 1–several from base, < 25 cm, often branched from leaf axils; hairs dense, simple and stellate
Leaves: basal 10–40 mm, oblanceolate, generally dentate, generally whitened; hairs dense, simple and branched, generally stellate with branches branched; cauline 2–12, toothed
Inflorescence < 60-flowered, elongate in fruit; lower pedicels generally bracted, appressed, generally < 3 mm
Flower: petals 3–5 mm, white
Fruit 4–12 mm, lanceolate to oblong, ± not wavy, ± not twisted; hairs generally > 3-branched, stellate; style < 1 mm
Seeds < 60, 0.6–1 mm; wings 0
Chromosomes: 2n=32
Ecology: Subalpine to alpine meadows, rock crevices
Elevation: > 3000 m.
Bioregional distribution: s High Sierra Nevada (e slope, Inyo Co.)
Distribution outside California: n&w US, Canada
Synonyms: D. lanceolata Royle misapplied

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