TREATMENT FROM THE JEPSON MANUAL (1993) |
previous taxon |
next taxon
Jepson Interchange (more information) |
|
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
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]
Introduced D. nemorosa L.
Annual (may germinate in winter); herbage hairs stiff, simple, forked, and stellate
Stems 1few from base, 330 cm, branched or not
Leaves: basal 1030 mm, widely lanceolate to obovate; cauline 07, generally dentate
Inflorescence 540-flowered; lowest pedicel > 2 X fruit
Flower: petals ± 24 mm, light yellow, generally entire
Fruit 311 mm, narrowly oblong to obovate; hairs 0 or short, stiff, simple; style < 0.1 mm
Fruits becoming widely separated on elongate axis
Seeds 2050, < 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
previous taxon | next taxon
Retrieve Jepson Interchange Index to Plant Names entry for Draba nemorosa
Retrieve dichotomous key for Draba
Return to treatment index page
Glossary
University & Jepson Herbaria Home Page | Copyright © by the Regents of the University of California