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; herbage hairs dense, stellate, multibranched
Leaves oblanceolate to widely obovate, entire to and shallowly dentate to lobed; basal and lower cauline petioled; middle and upper cauline petioles 0 or short
Inflorescence: bracts 0
Flower fragrant; sepals overlapped; petals erect, narrowly tongue-shaped, white to lavender
Fruit indehiscent, flat perpendicular to septum; 1-seeded halves ± round, each bordered by a raised rim; hairs simple, forked, club-like or not, especially dense on rim; pedicel < 3 mm, stout
Seed widely oblong, flat; wing 0; embryonic root at edges of both cotyledons
Species in genus: 2 species: CA, Mex
Etymology: (Greek: with 2 shields, from fruit)
Reference: [Rollins 1979 Publ Bussey Inst Harvard 3–32]


D. californica Harv.

Annual canescent; bases of cauline leaves, pedicels with paired glands
Stems arising below leaf clusters, decumbent to erect, 1–7 dm; branches 0 below, sparse or 0 above
Leaves not fleshy, canescent; basal 3–15 cm, oblanceolate to widely obovate, dentate to shallowly lobed, tip obtuse; cauline 1–4 cm, widely oblong to ovate
Flower: petals 12–15 mm, prominently 3-veined, whitish to light lavender
Fruit: hairs simple, club-like or not; pedicel spreading
Seed 3–4 mm
Chromosomes: 2n=20
Ecology: Abundant. Sandy places, washes, scrub
Elevation: < 1400 m.
Bioregional distribution: Desert
Distribution outside California: w Arizona, nw Mexico
Flowering time: Mar–May
Horticultural information: TRY.

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bioregional map for DITHYREA%20californica 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 Dithyrea californica
Retrieve dichotomous key for Dithyrea
Retrieve multiple-entry key (MEKA) for Dithyrea
Overlay Consortium of California Herbaria specimen data by county on this map
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