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.

LEPIDIUM

PEPPERGRASS, PEPPERWORT

Annual to shrub; hairs 0 or simple
Leaves: basal not rosetted, generally petioled, entire to pinnately lobed; cauline short-petioled to sessile, sometimes clasping or surrounding stem
Flower small; sepals erect or spreading, oblong to ovate, shed early or persistent; petals linear to obovate, generally white, rarely yellowish, sometimes bristle-like or 0; stamens 6, 4, or 2
Fruit dehiscent, oblong to elliptic or obcordate, flat perpendicular to septum; pedicel cylindric or flat, winged or not
Seeds 1 per chamber, gelatinous when wetted; wing narrow or 0; embryonic root at back of 1 cotyledon, rarely at edges of both
Species in genus: ± 175 species: ± worldwide
Etymology: (Greek: little scale, from fruit)
Reference: [Hitchcock 1936 Madroño 3:265–300]

Native

L. montanum Nutt.

Biennial to shrub-like, rounded; root crown simple or branched
Stems generally ± erect, 1–several, (1)2–4 dm; branches 0 or many
Leaves: basal 3–15 cm, pinnately lobed, lobes generally dentate or dissected; cauline reduced, upper generally entire, petioled to not
Inflorescence 2–4 cm, many-flowered
Flower: sepals 1.2 mm, hairs 0 to sparse; petals ± 2 mm, white to pale cream; stamens (2)6
Fruit 2.5–4 mm, ± ovate, glabrous; pedicel ± cylindric, slender; style > notch, 0.3–1 mm
Ecology: Sandy, gravelly, often saline soils
Elevation: 800–2100 m.
Bioregional distribution: Cascade Range, Great Basin Floristic Province, Mojave Desert
Distribution outside California: to Oregon, Montana, Arizona, n Mexico
11 often indistinct vars.

Native

var. montanum

Perennial (± biennial outside CA), ± woody at base or not; hairs of stems, pedicels sparse to dense, short, club-shaped, scale-like, or ± 0
Leaves: basal pinnately divided, segments lobed or toothed
Fruit 2.5–3 mm, elliptic to ovate, glabrous
Ecology: Clay or gravelly soils, washes, greasewood, saltbush
Elevation: 1400–1850 m.
Bioregional distribution: Great Basin Floristic Province
Distribution outside California: to Montana, Arizona

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