|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 or perennial herb from crown, glabrous to hairy; hairs sometimes forked at base, branches parallel with leaf surface, sometimes very unequal
Stem 0 or prostrate to erect
Leaves odd-1-pinnate; leaflets generally jointed to midrib; stipules membranous, sometimes fused around stem at stem base
Inflorescence: raceme, axillary, sometimes head- or umbel-like; flowers 2many
Flower bilateral; calyx 5-lobed; banner outside wings in bud, keel blades with small protrusion at base locking into pit on adjacent wing; 9 filaments fused, 1 free; ovary (and fruit) generally sessile, style slender, stigma minute
Fruit generally 1- or ± 2-chambered, often mottled, generally becoming ± dry; placenta on upper suture
Seeds 2many, smooth, compressed, ± notched at attachment scar
Species in genus: > 2000 species: ± worldwide (380 in North America, 94 in CA including many rare taxa)
Etymology: (Greek: ankle-bone or dice, perhaps from rattling of seeds within fruit)
Reference: [Barneby 1964 Mem NY Bot Gard 20:11188; Isely 1986 Iowa State J Res 61:157289]
Very difficult; both flower and fruit needed for identification; many good species appear similar; some species complexes need study. Taxa near province boundaries may appear in > 1 key. Varieties keyed under species for simplicity; species with vars. so identified in key. Fr length includes beak and any stalk-like base unless fruit body specified.
Perennial, leafy, ± minutely strigose
Stems ± decumbent or erect, generally many, 210 dm
Leaf 518 cm; leaflets 725, 525 mm, elliptic, ovate, or obovate, midrib often raised on lower surface, margins greenish, tips obtuse or shallowly notched
Inflorescence: flowers 1030, well separated, spreading or ascending
Flower: calyx green, lobes 0.72.6 mm; petals whitish to pale yellow, banner 813 mm, recurved 6090°, keel 6.210.8 mm, keel and wing claws 2.24.9 mm, keel blade 4.36.4 mm, > keel claw
Fruit spreading or ± ascending, 2560 mm, 1232 mm wide, bladdery, very thinly hairy, drying thinly papery; beak erect, pointed, strongly compressed side-to-side; chamber 1; deciduous
Ecology: Open areas
Elevation: 1502350 m.
Bioregional distribution: c&s Sierra Nevada, Tehachapi Mountain Area, Great Central Valley, South Coast Ranges, South Coast, San Bernardino Mountains, Peninsular Ranges
Distribution outside California: Baja California
Much like A. macrodon (with hairs ± spreading, ± wavy; leaflet margins purple), which may have nomenclatural priority; like A. pomonensis (leaflets 2541; keel blade = or < keel claw); vars. ± intergrade.
Stem prostrate to ± ascending, 27 dm
Leaf: leaflets 1125
Flower: calyx tube ± evenly hairy throughout, lobes generally 1.42.5 mm, narrow, pointed
Fruit 2560 mm
Ecology: Open areas
Elevation: 501500 m.
Bioregional distribution: c&s Sierra Nevada, Tehachapi Mountain Area, s Sacramento Valley, San Joaquin Valley, South Coast Ranges.