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.

POLYCTENIUM


Species in genus: 1 sp
Etymology: (Greek: many combs, from leaves)

Native

P. fremontii (S. Watson) Greene

Perennial, cespitose, often glaucous
Stems erect, few–several, generally simple, 5–15 cm; caudex without persistent leaf bases, branched
Leaf 1–2 cm, ± sessile, deeply pinnately lobed to compound, rigid; lobes or leaflets ± 1–5 mm, linear, often sharp-pointed with terminal hair; hairs stiff, generally branched
Inflorescence ± dense, ± umbel-like; bracts 0
Flower: sepals erect, 2–3 mm, oblong; petals 5–6 mm, white to pale purple
Fruit ascending to erect, often flat perpendicular to septum, glabrous; pedicel ascending, 4–6 mm, straight
Seeds 12–28, 1 row per chamber, ± 1 mm, oblong; wing 0; embryonic root at back of 1 cotyledon
Ecology: Saline soils, playas, lake margins, wet meadows
Elevation: 1000–2000 m.
Bioregional distribution: Great Basin Floristic Province
Distribution outside California: to Idaho, Nevada

Native

var. confertum Rollins


Fruit flat perpendicular to septum
Ecology: Uncommon. Playas, lake margins
Elevation: ± 2000 m.
Bioregional distribution: East of Sierra Nevada
Distribution outside California: Nevada
Horticultural information: TRY.

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