Jepson Flora Project: Jepson Interchange    

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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.


Species in genus: 1 sp
Etymology: (Greek: without fringe, from fruit, in contrast to fruit of Thysanocarpus )


A. pusillus (Hook.) Greene

Annual, small, leafy toward base
Stem 5–35 cm, often prostrate; branches generally from near base, slender; hairs simple or 2–5-branched
Leaves: basal 6–30 mm, 2–10 mm wide, entire or obscurely dentate, short-petioled, hairs coarse; cauline like basal, sessile, bases not lobed
Inflorescence terminal, slender, 1-sided, open; bracts 0
Flower inconspicuous; sepals ± 1 mm, early deciduous; petals 1–2 mm, spoon-shaped, white, sometimes 0
Fruit 2–2.5 mm wide, ± circular, flat parallel to septum, indehiscent; larger hairs flat, hooked, smaller hairs branched or 0; pedicel recurved, 1–4 mm; style < 0.3 mm, chamber 1
Seed 1, flat; embryonic root at edges of both cotyledons
Ecology: Grassy, open slopes, rocky outcrops
Elevation: generally < 1525 m.
Bioregional distribution: California Floristic Province (except Sierra Nevada), Desert Mountains (Granite Mtns)
Distribution outside California: to British Columbia, Montana, Mexico

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bioregional map for ATHYSANUS%20pusillus being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Athysanus pusillus
Retrieve dichotomous key for Athysanus
Overlay Consortium of California Herbaria specimen data by county on this map
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