Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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.



Annual, biennial, rarely per; hairs generally minute, generally multibranched, fewer simple, some glandular
Stem branched
Leaves 1–many-pinnately lobed to compound; basal often rosetted but withering
Inflorescence elongating; bracts generally 0
Flower: petals < 3 mm, yellow or whitish, blades obovate, obtuse
Fruit linear to ± obovate, straight or uneven-margined, generally ± cylindric; style < 0.8 mm or 0, stigma generally head-like, entire
Seeds: 1–2 rows per chamber, generally < 1 mm, elliptic, plump, gelatinous when wet; wing 0; embryonic root at back of 1 cotyledon
Species in genus: ± 40 species: worldwide temp
Etymology: (F. Descourain, French botanist, 1658–1740)
Reference: [Detling 1939 Amer Midl Naturalist 22: 481–520]
Relationships, characters of species difficult. May be TOXIC to livestock.


D. obtusa (Greene) O.E. Schulz subsp. adenophora (Wooton & Standl.) Detling

Biennial, erect, coarse, whitish
Stem generally 1, simple or branched above
Leaf 1–6 cm, 1-pinnately lobed or -compound, canescent; hairs minute, multibranched, rarely glandular; lobes or leaflets 2–5 pairs, linear to oblanceolate, tip generally obtuse
Flower: sepals 2–2.5 mm, ± < petals, sparsely glandular; petals yellowish
Fruit 5–15 mm, linear, straight, generally glabrous; both ends tapered abruptly; pedicel ascending to spreading, 12–25 mm, sparsely glandular
Seeds 24–32 per chamber, 1–2 rows per chamber, closely packed, 0.7–1 mm
Ecology: Gravelly flats, open woods, lake margins
Elevation: 900–2200 m.
Bioregional distribution: e Peninsular Ranges, Mojave Desert
Distribution outside California: to New Mexico, Baja California
Flowering time: May–Jun

previous taxon | next taxon
bioregional map for DESCURAINIA%20obtusa%20subsp.%20adenophora being generated

Retrieve Jepson Interchange Index to Plant Names entry for Descurainia obtusa subsp. adenophora
Retrieve dichotomous key for Descurainia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California