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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BRASSICACEAE

MUSTARD FAMILY

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.

RAPISTRUM

WILD TURNIP

Annual, perennial herb; hairs simple
Leaves: lower petioled, pinnately lobed to compound; upper sessile or short-petioled, simple, subentire to dentate
Inflorescence dense; bracts 0
Flower: petals obovate, clawed
Fruit elliptic to widely oblong, breaking transversely into 2 indehiscent segments, sessile above receptacle; pedicel slender to thick; valves rigid, generally wrinkled
Seeds generally 1–3, oblong or ovate, ± flat; cotyledons folded lengthwise
Species in genus: 2 species: Eur
Etymology: (Latin: turnip-like)

Introduced

R. rugosum (L.) All.

Annual, erect; hairs stiff
Stem 3–10 dm, branched
Leaf oblanceolate to (ob)ovate, scabrous
Flower: sepals 2.5–3 mm; petals 5–9 mm, yellow, dark-veined
Fruit hairy or not; lower part 2.5–3.5 mm, upper 2.5–4 mm, ± round, ribbed; pedicel erect, appressed, 2.5–3 mm, tip thick; style 1.5–3.5 mm, stigma 2-lobed
Chromosomes: 2n=16
Ecology: Disturbed areas, fields
Elevation: < 200 m.
Bioregional distribution: San Francisco Bay Area
Distribution outside California: to Oregon, eastern US, Mexico; native to s Europe

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bioregional map for RAPISTRUM%20rugosum 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 Rapistrum rugosum
Retrieve dichotomous key for Rapistrum
Overlay Consortium of California Herbaria specimen data by county on this map
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