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. modesta Rollins

MODEST ROCK CRESS

Perennial; caudex simple or closely branched; hairs forked to multibranched, small, often appressed
Stems 1 or few, simple or generally branched above, 2.5–6 dm, hairy
Leaves: hairs dense; basal petioled, 2–6 dm, obovate, margin wavy or entire, lower surface often purplish, tip obtuse; cauline few, well spaced, sessile, 1–2.5 cm, oblong, shallowly dentate to entire
Flower: petals spoon-shaped, purple to pink-purple
Fruit ascending to ± spreading, 3.5–6 cm, glabrous; tip acute; pedicel ascending to ± spreading, hairy; style 1.5–2 mm
Seed oblong; wing on 1 end
Chromosomes: 2n=16
Ecology: UNCOMMON. Deep soil on steep slopes, cliffs, shaded canyon ledges
Elevation: < 800 m.
Bioregional distribution: Klamath Ranges, North Coast Ranges
Distribution outside California: s Oregon
Isolated plants near Yolo-Napa Co. line need study
Horticultural information: DRN, SHD: 7, 14, 15, 16; DFCLT.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for ARABIS%20modesta being generated
 


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