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

Perennial; spines stipular
Stem decumbent to erect
Leaves odd-1-pinnate; stipules spiny or 0; leaflets 9–many
Inflorescence: raceme, spike-like, terminal
Flower: calyx tube sometimes bulged on 1 side near base, lobes < or > tube, upper pair fused 1/2 or more; corolla pink or white; 9 filaments fused, 1 free; style tip finely hairy around stigma
Fruit dehiscent, oblong, ± flat but plump, leathery; base stalk-like
Species in genus: 4 species: s US, Mex
Etymology: (R. Peter, 19th century Kentucky botanist)
Reference: [Porter 1956 Rhodora 58:344–354]


P. thompsoniae S. Watson


Plant rhizomed; taproot often swollen
Stem 2–6 dm
Leaf: leaflets 13–21, elliptic or obovate
Inflorescence often glandular-hairy
Flower: calyx 11–15 mm, tube cylindric, generally darkly glandular-puberulent; corolla generally 15–20(25) mm; style hairs often hidden by pollen
Fruit 4–6 cm, glabrous
Ecology: Sandy alluvial fans
Elevation: 800 m.
Bioregional distribution: Desert Mountains (California Valley, se Inyo Co.)
Distribution outside California: to Idaho, Utah, sw Colorado, Arizona
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for PETERIA%20thompsoniae being generated

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