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.



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)


A. holboellii Hornem.

Biennial, perennial herb; caudex branched or not; hairs generally multibranched
Stems 1–several, erect
Leaves: basal 1–5 cm, linear-oblanceolate to widely spoon-shaped, tip acute, hairs dense; cauline sessile, 2–4 cm, oblong to lanceolate, entire, lower surface densely hairy, upper surface ± hairy to not
Flower: petals purplish pink to whitish
Fruit 3–7 cm, generally ± straight, glabrous; pedicel arched or recurved to ± reflexed, (4)6–16 mm, straight to ± curved, slender, hairy or not
Seed round; wing narrow all around
Ecology: Rocky slopes, open sites
Elevation: 500–3500 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, San Francisco Bay Area, Great Basin Floristic Province
Distribution outside California: to Alaska, e Canada, NE
5 vars. in North America, difficult to distinguish, especially in flower.


var. pendulocarpa (A. Nelson) Rollins

Stem generally simple, 1–2 dm, slender; hairs present below, ± 0 above
Leaves: basal < 3 mm wide, entire; cauline base tapered
Fruit pendent
Chromosomes: 2n=14
Ecology: Rocky slopes
Elevation: 1800–3000 m.
Bioregional distribution: c High Sierra Nevada, Great Basin Floristic Province
Distribution outside California: to British Columbia, Colorado
Flowering time: May–Jul

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bioregional map for ARABIS%20holboellii%20var.%20pendulocarpa being generated

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