Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
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; hairs ± dense, stellate, rarely simple, often silvery
Stem generally arising laterally from basal leaf cluster
Leaves simple; basal petioled, linear to round, entire to pinnately lobed; cauline sessile or lower short-petioled, base tapered
Flower: sepals erect or spreading, oblong to elliptic; petals widely obovate, entire, generally yellow; stamens 6
Fruit elliptic to ± round, plump or ± flattened parallel or perpendicular to septum; hairs stellate or 0; pedicel slender, straight or not
Seeds 2–10(14) per chamber, ± round, ± plump or flat; margin generally 0; embryonic root at edges of both cotyledons
Species in genus: ± 95 species: generally North America, ± 12 South America
Etymology: (L. Lesquereux, Am botanist, 1805–1889)
Reference: [Rollins & Shaw 1973 Harvard Univ Press: 1–228]


L. occidentalis (S. Watson) S. Watson subsp. occidentalis

Perennial; hairs dense, 4–7-rayed
Stem prostrate to erect, many, 0.3–1.5(3) dm, generally unbranched
Leaves: basal 1–8 cm, wavy-margined or dentate to entire, elliptic to round, narrowed to slender petioles; cauline 0.5–1.5(2.5) cm, oblanceolate, entire or sparsely dentate, lower short-petioled
Flower: petals 7–9(14) mm
Fruit elliptic to obovate, ± flat parallel to septum, especially near margins, often near tip, often ± beaked; valve hairs dense, appressed or ± spreading outside, 0 or sparse inside; pedicel 5–10(15) mm, C- or S-shaped; style 2–6.5 mm, often hairy
Seeds 2 per chamber, marginless
Chromosomes: 2n=10
Ecology: Gravelly soils, talus, ridges
Elevation: 1600–3000 m.
Bioregional distribution: Klamath Ranges, High North Coast Ranges, High Cascade Range, n High Sierra Nevada, Modoc Plateau
Distribution outside California: to Oregon, Idaho
Synonyms: L. cusickii M.E. Jones
2 subspp. total
Horticultural information: DRN, SUN, IRR: 1, 2, 3, 7, 14, 15, 16, 17, 18.

previous taxon | next taxon
bioregional map for LESQUERELLA%20occidentalis%20subsp.%20occidentalis being generated

Retrieve Jepson Interchange Index to Plant Names entry for Lesquerella occidentalis subsp. occidentalis
Retrieve dichotomous key for Lesquerella
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California