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. rigidissima Rollins var. rigidissima
TRINITY MOUNTAINS ROCK CRESS
Perennial; caudex branched or not, woody; hairs multibranched or forked, spreading, fine
Stems 1several, 24 dm; hairs 0 or below, sparse
Leaves: basal narrowly petioled, 1.53 cm, spoon-shaped, hairy; cauline well spaced, sessile, 12 cm, ovate to oblong, entire, glabrous, base lobed and clasping stem
Flower: petals spoon-shaped, pink
Fruit ascending, 47 cm, 2.53.5 mm wide, straight, glabrous; margin wavy; pedicel ascending, 510 mm, glabrous; style < 1 mm or 0
Seed oblong to round, wing narrow
Ecology: UNCOMMON. Open, gravelly or rocky soil
Elevation: 16002200 m.
Bioregional distribution: Klamath Ranges.2 vars. total.
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