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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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]

Introduced

L. perfoliatum L.

Annual, biennial
Stem (1)2–6 dm, ± puberulent below, glabrous above; branches 0–many
Leaves: basal 2–3-pinnately lobed or divided, segments linear; upper cauline ovate to round, entire or minutely dentate, surrounding stem
Flower: petals ± 1.5 mm, narrowly spoon-shaped, yellowish; stamens 6
Fruit ± 4 mm, diamond-shaped-ovate; hairs 0, rarely few; pedicel generally > fruit, slender, cylindric, glabrous; style ± 0.2 mm, ± = notch
Chromosomes: 2n=16
Ecology: Roadsides, fields
Elevation: 600–1500 m.
Bioregional distribution: Cascade Range, Great Central Valley, Inner South Coast Ranges, Great Basin Floristic Province, Desert
Distribution outside California: widespread N.America; native to Eurasia
Flowering time: Mar–Jun

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bioregional map for LEPIDIUM%20perfoliatum being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Lepidium perfoliatum
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