Jepson Flora Project: Jepson Interchange    

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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.



Annual, perennial herb; hairs simple
Stem erect, branched, glabrous above
Leaves: basal and lower cauline petioled, dentate to pinnately lobed, lateral lobes < terminal
Inflorescence terminal; bracts ± 0
Flower: sepals erect; petals generally yellow
Fruit linear; valves 1-veined; beak conic or cylindric, with seeds 0 or rarely 1–2
Seeds many, 1 row per chamber, spheric, finely to coarsely netted
Species in genus: ± 35 species: Medit, Eurasia, some naturalized ± worldwide
Etymology: (Latin: cabbage)
Naturalizing CVS soon lose desirable food properties. B. oleracea L., cabbage, with thick, glaucous leaves and open inflorescence, is established on se-facing seacliffs, n CCo, c&s NCo.


B. nigra (L.) W.D.J. Koch


Annual; hairs sparse to dense, stiff, especially below
Stem 4–20 dm, generally branched above
Leaves: basal pinnately lobed, serrate-dentate; cauline similar to basal but upper smaller, sessile, base tapered
Flower: petals 7–11 mm
Fruit erect, 1–2 cm; pedicel erect, ± appressed
Seed ± 2 mm wide, coarsely netted
Chromosomes: 2n=16
Ecology: Abundant. Fields, disturbed areas
Elevation: < 1500 m.
Bioregional distribution: California Floristic Province
Distribution outside California: native to Europe

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bioregional map for BRASSICA%20nigra being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Brassica nigra
Retrieve dichotomous key for Brassica
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