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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.



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

Species in genus: 1 sp
Etymology: (S.T. Olney, Am botanist, 1812–1878)


O. tesota A. Gray


Shrub or tree with stipular spines, canescent
Leaves even-1-pinnate, alternate or clustered; stipular spines sometimes 0 or breaking off, leaving scar, sometimes persisting above leaves and appearing internodal; leaflets 8–19, opposite or subopposite, obovate or elliptic, thick; axis extending beyond leaflets, pointed
Inflorescence: raceme, axillary, 2–4-flowered
Flower: corolla 10–12 mm, wings purple, other petals yellow-white to pink; 9 filaments fused, 1 free
Fruit slowly dehiscent, oblong or elliptic, plump, irregularly narrowed between seeds, persistent
Seeds 1–3
Chromosomes: 2n=18
Ecology: Often abundant in washes
Elevation: < 600 m.
Bioregional distribution: Peninsular Ranges, Sonoran Desert
Distribution outside California: Arizona, Mexico
Flowering time: Apr–May
Fls erratically
Horticultural information: DRN, DRY: 8, 9, 14, 19, 21, 23, IRR: 10, 11, 12, 13; DFCLT.

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