|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual to tree
Leaves generally compound, alternate, stipuled; leaflets generally entire
Inflorescence: generally raceme, spike, umbel or head; flowers sometime 12 in axils
Flowers generally bisexual, generally bilateral; hypanthium generally flat or cup-like; sepals generally 5, fused; petals generally 5, free, or the 2 lower ± fused; stamens 1many, often 10 with 9 filaments at least partly fused, 1 (uppermost) free; pistil 1, ovary superior, generally 1-chambered, ovules 1many, style, stigma 1
Fruit: legume, sometimes including a stalk-like base above receptacle, dehiscent, or indehiscent and breaking into 1-seeded segments, or indehiscent, 1-seeded, and achene-like
Seeds 1several, often ± reniform, generally hard, smooth
Genera in family: ± 650 genera, 18,000 species: worldwide; with grasses, requisite in agriculture and most natural ecosystems. Many cultivated, most importantly Arachis , peanut; Glycine , soybean; Phaseolus , beans; Medicago ; Trifolium ; and many orns
Reference: [Polhill & Raven (eds) 1981 Advances in legume systematics; Allen & Allen 1981 Leguminosae]
Family description and key to genera by Duane Isely.
Annual, perennial herb, shrub, unarmed
Leaves generally odd-1-pinnate (sometimes ± palmately compound, rarely some or most simple); stipules conspicuous or not; leaflets 3many, often irregularly arranged
Inflorescence: umbel or 12-flowered, axillary, generally peduncled, often bracted
Flower: corolla generally yellow (sometimes white or pink), fading darker; 9 filaments fused, 1 free
Fruit dehiscent or not, exserted from calyx or not, ovoid to oblong, ± beaked
Etymology: (Greek: derivation unclear)
Reference: [Isely 1981 Mem New York Bot Garden 25:128206]
Spp. generally variable; intermediates may be hybrids. Key below separates natural groups.
Perennial, finely strigoseSee the CNPS Inventory for information about endangerment and rarity.
Stem ascending or sprawling, bushy, sparsely leafy, rush-like
Leaf subpalmate, tiny, deciduous; stipules gland-like or 0; leaflets 3, 25 mm, elliptic
Inflorescence 12-flowered; peduncle < 3 mm or 0, bract 0
Flower: calyx 2.53 mm, lobes < tube; corolla 45 mm, keel > other petals
Fruit indehiscent, exserted, ascending or reflexed, 69 mm, oblong, curved, beaked
Ecology: Creosote-bush scrub to pinyon/juniper woodland
Elevation: 6001200 m.
Bioregional distribution: se Peninsular Ranges, sw Sonoran Desert (especially San Diego Co.)
Distribution outside California: Baja California
Flowering time: MarJun
Local, little known.