Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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



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.


Duane Isely

Annual, perennial herb, unarmed, gland-dotted
Leaves generally odd-1-pinnate; stipules inconspicuous, thread-like or glandular
Inflorescence: spike in CA; bracts generally ± conspicuous
Flower: calyx tube 10-ribbed; banner arising from receptacle, other petals from side or top of filament column; stamens 9–10 or 5, filaments fused; ovules 2
Fruit indehiscent, included in or slightly exserted from calyx
Seed 1
Species in genus: ± 165 species: w US, Mex, s South America
Etymology: (T. Dale, English botanist, 18th century)
Reference: [Barneby 1977 Mem New York Bot Gard 27:135–582, 650–877]
Incl species sometimes placed in Petalostemon ; except others found here in Marina , Psorothamnus.

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