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.



Perennial, silvery; taproot enlarged; hairs stellate, generally ± sessile, appressed
Stems several–many, generally from below rosette; outer prostrate to decumbent
Leaves: basal obovate to ± round, < petioles; cauline entire, upper generally sessile
Flower: petals yellow
Fruit widely obovate to ± round, inflated; tip notched to ± middle, generally also notched from base; valves shed with seeds enclosed; style persistent
Seeds 2–6 per chamber, ± flat; margins 0; embryonic root at edges of both cotyledons
Species in genus: 22 species: w North America, generally Rocky Mtns, Great Basin
Etymology: (Greek: bellows, from inflated fruit)


P. chambersii Rollins

Plant cespitose
Stem unbranched, 5–15 cm
Leaves: basal 3–6 cm, 1–2 cm wide, entire to dentate, tip obtuse; cauline 1–2 cm, spoon-shaped, tip generally acute
Inflorescence 2–10 cm, dense, ± umbel-like
Fruit 1–1.5 cm, hairy; notch in base shallow or ± 0; septum 4–6 mm; pedicel ascending to spreading, 8–15 mm; style 6–8 mm, exserted from notch
Seeds generally 4 per chamber
Chromosomes: 2n=8, 10,16,24
Ecology: Limestone soils
Elevation: 1500–2500 m.
Bioregional distribution: n Desert Mountains (Clark, Grapevine mtns)
Distribution outside California: to Oregon, Utah, Arizona
Flowering time: May
Horticultural information: TRY; DFCLT.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for PHYSARIA%20chambersii being generated

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