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. deserti (M.E. Jones) Rollins

Annual; hairs minute, branched
Stem 1, 1–3 dm; branches 0 or above
Leaves: basal shed early; cauline 2–4 cm, hairs sparse; lower cauline deeply pinnately divided, segments 4–8 mm
Flower: sepals 1.5–2 mm, oblong; petals 2–3 mm, spoon-shaped, white
Fruit spreading to ± pendent, 10–15 mm, < 1.5 mm wide, flat, ± curved; hairs sparse; pedicel spreading to reflexed, 3–4 mm, hairy or not; style 1–1.5 mm
Seed < 1 mm wide, oblong; wing 0; embryonic root at edges of both cotyledons
Chromosomes: 2n=26
Ecology: Washes, steep hillsides, dry flats
Elevation: 350–1300 m.
Bioregional distribution: n Mojave Desert
Distribution outside California: Nevada
Flowering time: Mar–Apr
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for SIBARA%20deserti being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Sibara deserti
Retrieve dichotomous key for Sibara
Overlay Consortium of California Herbaria specimen data by county on this map
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