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, biennial, perennial herb; hairs simple, generally 0
Stem branched or not
Leaves simple, entire to dentate; basal ± petioled; cauline sessile, clasping stem
Flower: sepals green or purple-tinged, bases not sac-like; petals 1–2 X sepals, white to purplish
Fruit obcordate or obovate to round, flat perpendicular to septum, tip rounded or notched; valves keeled, often winged
Seeds 2–8 per chamber, ± striate; wing 0; embryonic root at edges of both cotyledons
Species in genus: ± 75 species: temp, generally n hemisphere
Etymology: (Greek: to crush shield, from flat fruit or perhaps use of crushed seeds as mustard)
Reference: [Holmgen 1971 Mem NY Bot Gard 21:1–106]


T. californicum S. Watson


Perennial, glaucous or not; caudex branched or not
Stem 1–12(20) cm, simple, slender
Leaves: basal many, 2–4 cm, sparsely dentate; cauline sessile, 1–1.5 cm, entire to dentate, lobed at base, clasping stem, green or purplish
Inflorescence 5–10 cm, open
Flower: sepals 2.5–4 mm, green to purplish; petals spoon-shaped, white
Fruit 7–10 mm, 2–3 X longer than wide, elliptic to obovate; tip acute; wing 0; pedicel ascending; style 1.5–2 mm
Seeds 2–6, dark brown
Ecology: Serpentine outcrops
Elevation: 500–700 m.
Bioregional distribution: Outer North Coast Ranges (Kneeland Prairie)
Synonyms: T. alpestre L. var. c. (S. Watson) Jeps.; T. montanum L. var. c. (S. Watson) P. Holmgren
Horticultural information: In cultivation.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for THLASPI%20californicum 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 Thlaspi californicum
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