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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



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; hairs 0 or simple
Stem erect to ascending, slender; branches 0–many
Leaves simple, sessile, entire, dentate, or pinnately lobed
Inflorescence elongate; bracts 0
Flower: sepals ascending, bases not sac-like; petals white or purple; stamens 6, ± equal, ± exserted
Fruit generally elliptic to round, very flat, 1-chambered (septum 0), indehiscent; wing entire to lobed, often perforated; rays 0 to very distinct; pedicel very slender
Seed 1, smooth; embryonic root at edges of both cotyledons
Species in genus: 5 species: North America
Etymology: (Greek: fringe fruit)


T. radians Benth.

Plant glabrous, sometimes except fruit
Stem 1.5–5 dm; branches few
Leaves: basal and lower cauline 1.5–5 cm, wavy-margined to pinnately lobed, shed early; cauline ± ovate, subentire, base lobed, clasping stem
Inflorescence elongate, open
Flower: sepals ± 2 mm, generally purplish; petals ± = sepals, white or purple-tinged
Fruit pendent, (6)8–10 mm, ± round; hairs 0 to dense; wing wide, entire, membranous, not perforated; rays very distinct, vein-like; pedicel ascending, reflexed near tip; style < 0.2 mm, generally not exserted from sinus
Ecology: Moist slopes, pastures, open meadows
Elevation: < 1200 m.
Bioregional distribution: Northwestern California, Sacramento Valley, San Francisco Bay Area
Distribution outside California: Oregon
Horticultural information: SUN, DRN: 4, 5, 6, 15, 16, 17 &IRR: 7, 8, 9, 14, 18, 19, 20, 21, 22, 23, 24.

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