TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
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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 1many 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 80:686699; 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. breweri S. Watson
Perennial, cespitose; caudex woody, many-branched
Stems severalmany, simple, 0.52 dm; hairs dense below, often 0 above
Leaves: basal short-petioled, 13 cm, oblanceolate, entire to few-toothed, hairs on both surfaces generally 3-forked, tip acute; cauline sessile, 12(4) cm, oblong-lanceolate to oblong, base lobed, clasping stem
Flower: petals spoon-shaped, reddish purple to pink
Fruit spreading-ascending, ± curved to ± straight; pedicel erect to ascending, 315 mm, generally hairy
Seed round; wing narrow
Ecology: Rocky places
Elevation: 4503200 m.
Bioregional distribution: Klamath Ranges, Inner North Coast Ranges, Cascade Range, n Sierra Nevada Foothills, Sacramento Valley, San Francisco Bay Area, Inner South Coast Ranges, San Bernardino Mountains
Distribution outside California: s Oregon
Native var. austiniae (Greene) Rollins
Leaves: cauline 24 cm, ± glabrous to hairy
Flower: sepals purple, hairs sparse; petals 1013 mm
Fruit 57 cm; pedicel 11.5 cm, generally hairy
Ecology: Rock outcrops, canyon walls
Elevation: 6002300 m.
Bioregional distribution: Cascade Range Foothills, n Sierra Nevada Foothills, Sacramento Valley
Horticultural information: DRN, DRY: 7, 8, 9, 14, 18, 19, 20, 21, 22, 23, 24 &SUN: 6, 15, 16, 17.
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