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.

SIBARA

Annual, biennial
Stems 1–several from base, generally erect; hairs 0 or simple or branched
Leaves: basal and lower cauline pinnately lobed to 1-pinnate; upper often simpler, grayish green
Inflorescence elongate, open
Flower small; sepals ± oblong to ovate, bases generally not sac-like; petals spoon-shaped to ± oblong, white to purplish
Fruit linear, flat parallel to septum or ± cylindric; valve veined or not
Seed oblong or ± round, winged or not; embryonic root at back of 1 cotyledon or at edges of 1 or both
Species in genus: 10 species: North America
Etymology: (Anagram of Arabis)

Native

S. virginica (L.) Rollins

Annual, biennial
Stems 1–several, decumbent to ascending, 1–3 dm, branched; hairs below, simple, rarely forked
Leaves: basal loosely rosetted, 2–6 cm, pinnately lobed, linear to oblong, hairs especially on petioles, sparse; cauline like basal
Flower: sepals ± 1.5 mm, generally purplish; petals ± > sepals, spoon-shaped, white
Fruit ascending to erect, 2–2.5 cm, 1.7–2 mm wide, flat, straight, glabrous; pedicel ascending, 2–4 mm; style ± 0
Seed 1–1.5 mm wide, ± round; wing narrow, conspicuous; embryonic root at edges of both cotyledons
Chromosomes: 2n=16
Ecology: Borders of vernal pools, streambanks, open ground
Elevation: < 300 m.
Bioregional distribution: Great Central Valley
Distribution outside California: to e US, Baja California

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bioregional map for SIBARA%20virginica being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Sibara virginica
Retrieve dichotomous key for Sibara
Overlay Consortium of California Herbaria specimen data by county on this map
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