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: (A. Nelson, Rocky Mountain botanist, 1859–1952)


A. eurycarpa (A. Gray) J.F. Macbr. & Payson

Perennial; roots deep; caudex loosely branched; hairs branched, dense on leaves, inflorescence axes, sepals
Leaves basal, dense, overlapped, entire, canescent; base tapered
Inflorescence scapose, umbel-like
Flower: sepals early deciduous, bases not sac-like; petals small, white; stigma 2-lobed
Fruit 2–3 cm, 5–7 mm wide, lanceolate-elliptic, flat parallel to septum, glabrous, generally purplish; base ± obtuse or rounded; tip ± tapered, sharp-pointed; valves leathery; pedicel erect to ascending; style 1–2 mm
Seeds several–many, 2 rows per chamber, 2.5–3 mm, ± flat, oblong; coat silvery; wing 0; hairs dense, minute, club-shaped; embryonic root at edges of both cotyledons
Ecology: Broken rock, talus, slopes, ridges
Elevation: > 3000 m.
Bioregional distribution: Sierra Nevada, East of Sierra Nevada
Distribution outside California: to Idaho, Nevada
Flowering time: Jul–Aug
Synonyms: Phoenicaulis e. (A. Gray) Abrams

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