|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.
Perennial or shrub, unarmed
Leaves even-1-pinnate; main axis ending in a tiny bristle; leaflets alternate or opposite, many, small, sensitive to touch
Flower: corolla white to red or purple; filaments partly fused, generally splitting into 2 groups of 5
Fruit ± narrowed between seeds, breaking into 1-seeded segments
Species in genus: ± 150 species: especially standing water, tropical and warm regions.
Plant somewhat bristly-hairy, finely gland-dotted
Leaf: stipule ± peltate, deciduous, lower lobe rounded to fringed; leaflets generally 910 mm, entire or minutely serrate
Flower: corolla 815 mm, whitish, purple-tinged
Fruit 47 mm wide; lower margin indented between seeds; stalk-like base 410 mm
Ecology: Rice fields
Elevation: < 20 m.
Bioregional distribution: Sacramento Valley (ne Colusa Co.), expected more widely
Distribution outside California: se US; native to Asia
Range as rice-field weed apparently expanding.