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]
Native D. howellii S. Watson
HOWELL'S DRABA
Perennial
Stems ± tufted, < 15 cm; hairs 0 or simple and forked, coarse or not
Leaves: basal 525 mm, obovate, entire or finely toothed; tip generally rounded; surface hairs 0 or generally 34-branched, generally stellate; margin hairs generally 0; cauline generally 13, bract-like
Inflorescence 1030-flowered
Flower: petals 48 mm, yellow
Fruit 410 mm, ± ovate; hairs 0 or generally simple, forked, and cross-shaped; style 1.23.2 mm
Seeds ± 1020, 1.21.6 mm; wings 0
Ecology: UNCOMMON. Rock crevices
Elevation: 20003000 m.
Bioregional distribution: Klamath Ranges
Distribution outside California: sw Oregon
Horticultural information: DRN, SUN: 4, 5, 6, 17 &IRR: 1, 2, 3, 7, 15, 16; DFCLT.
previous taxon | next taxon
Retrieve Jepson Interchange Index to Plant Names entry for Draba howellii
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