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

BRASSICACEAE

MUSTARD FAMILY

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.

ARABIS

ROCK CRESS

Biennial, perennial herb; base woody or not; hairs 0 to dense, simple, forked, stellate, or multibranched; caudex branched or not
Stem branched or not, cylindric, leafy
Leaves: basal petioled, entire or dentate; cauline generally sessile, entire or dentate, base often lobed, often clasping stem
Inflorescence: bracts 0
Flower erect to reflexed; sepals erect; petals spoon-shaped to oblong and narrowed at base or narrowly obovate, white to deep purple, rarely straw-colored
Fruit erect to reflexed, linear, straight to curved, flat parallel to septum, rarely ± cylindric
Seeds ± many, generally 1 row per chamber, flat or plump, winged or not; embryonic root at edges of both cotyledons
Species in genus: ± 120 species: temp North America, Eurasia, Africa
Etymology: (Latin: of Arabia)

Native

A. suffrutescens S. Watson

Perennial; base woody; caudex widely branched
Stems several–many, simple, rarely branched above; hairs ± 0 or below, multibranched or stellate
Leaves: hairs 0 to dense; basal 1–4 cm, linear to ± spoon-shaped; cauline few, sessile, 1–3 cm, lanceolate, base lobed, clasping stem
Flower: petals 5–7 mm, spoon-shaped, rose to purplish
Fruit 3–6 mm wide, glabrous; tip acute; pedicel 4–10 mm, slender, glabrous; style < 1 mm or 0
Seed round; wing all around, wide
Ecology: Gravelly to rocky slopes, basalt, pumice, serpentine
Elevation: ± 1500 or 1700–2800 m.
Bioregional distribution: e Klamath Ranges, n High North Coast Ranges, Cascade Range, Sierra Nevada, n East of Sierra Nevada
Distribution outside California: to Oregon, Idaho

Native

var. horizontalis (Greene) Rollins


Stem 1–3 dm, hairy below
Leaves: basal hairy
Fruit spreading to ± recurved, 2–3 cm
Ecology: Gravelly or stony slopes, serpentine, dry pumice
Elevation: ± 1500 m.
Bioregional distribution: n High North Coast Ranges (Grouse Mtn), n Cascade Range
Distribution outside California: s Oregon

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