Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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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.

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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