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. montanum L. var. montanum

Perennial, ± glaucous; caudex branched or not
Stems 1–many, 1–4 dm, rarely branched, slender
Leaves: basal many, 1–3 cm, oblong to (ob)ovate, ± entire, green to purplish, petioles 1–2 X blades; cauline sessile, 0.5–2 cm, entire or shallowly dentate, lobed at base, ± clasping stem
Inflorescence 2–8(25) cm, ± open
Flower: sepals 2–3.5 mm, green to purplish, margin membranous; petals spoon-shaped, white to purplish pink
Fruit 5–8(12) mm, 1–2 X longer than wide, obovate to obcordate; tip generally truncate or notched, rarely ± acute; wing 0; pedicel spreading to ± ascending; style 1–2 mm
Seeds 4–8, faintly striate
Chromosomes: 2n=28
Ecology: Talus, alluvial slopes, meadows
Elevation: < 2000 m.
Bioregional distribution: Klamath Ranges, Cascade Range, Modoc Plateau
Distribution outside California: to Washington, Rocky Mtns, Mexico
Synonyms: T. glaucum Nelson var. hesperium Payson; T. fendleri A. Gray var. h. (Payson) C.L. Hitchc
Horticultural information: DRN, IRR, SUN: 1, 2, 3, 7, 10, 14, 15, 16, 18, 19, 20, 21; DFCLT.

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bioregional map for THLASPI%20montanum%20var.%20montanum 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 montanum var. montanum
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