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
Stems 1–few, branched or not, slender
Leaves: basal in rosette, petioled; cauline sessile, base tapered or lobed, clasping stem or not
Inflorescence terminal, open
Flower small; sepal bases not sac-like; petals white, pale purple, or yellowish
Fruit linear, glabrous; pedicel ascending; style short or 0
Seeds many, ± 1 row per chamber, plump; wing 0; embryonic root at back of 1 cotyledon
Species in genus: Few but controversial number of species: Eur, Asia, 1 native to North America
Etymology: (Greek: resembling Arabis )


A. thaliana (L.) Heynh.


Annual, freely branched
Stem 1–4 dm; hairs below simple, spreading, above 0
Leaves: basal oblanceolate, entire or minutely dentate, hairs coarse, branched; cauline few, base tapered
Flower: petals white
Fruit 1–1.5 cm, < 1 mm wide, linear, ± cylindric to ± flat; pedicel erect to ascending, 5–10 mm, slender
Seed < 1 mm, oblong
Chromosomes: 2n=10
Ecology: Uncommon. Disturbed, open ground
Elevation: < 1000 m.
Bioregional distribution: North Coast, Inner North Coast Ranges, San Francisco Bay Area, expected elsewhere
Distribution outside California: to e US (where abundant); native to Europe
Often used in experimental genetics, physiology, biochemistry.

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bioregional map for ARABIDOPSIS%20thaliana 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 Arabidopsis thaliana
Retrieve dichotomous key for Arabidopsis
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
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