Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

FABACEAE

LEGUME FAMILY

Annual to tree
Leaves generally compound, alternate, stipuled; leaflets generally entire
Inflorescence: generally raceme, spike, umbel or head; flowers sometime 1–2 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 1–many, often 10 with 9 filaments at least partly fused, 1 (uppermost) free; pistil 1, ovary superior, generally 1-chambered, ovules 1–many, 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 1–several, 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.

PHASEOLUS

WILD BEAN

Duane Isely

Annual, perennial herb, vine, unarmed; hairs generally including minute, hooked ones
Leaves odd-1-pinnate; main axis extended beyond basal leaflets, with stipule-like appendages, at least at tip; stipules persistent; leaflets 3, entire or lobed
Inflorescence: raceme; bracts persistent
Flower: calyx lobes << tube; corolla incurved, sickle-shaped in bud, keel coiled 2–3 turns; 9 filaments fused, 1 free
Fruit dehiscent, linear to oblong, flat or round in X -section
Seeds few–several
Species in genus: ± 50 species: neotrop, warm regions; those of economic value on all continents
Etymology: (Classical name, presumably for a bean)
P. vulgaris L., P. lunatus L., and others may be found as waifs from cultivated.

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