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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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, shrub, small tree, generally with thorns, gland-dotted
Stem generally intricately branched
Leaves odd-1-pinnate or simple
Inflorescence: raceme, sometimes spike- or head-like, axillary or terminal; pedicels generally with bractlets
Flower: calyx lobes generally unequal, upper pair often largest; petals all arising from receptacle, violet, blue, or 2-colored (purple and white); stamens 10, filaments partly fused; ovules generally 2
Fruit indehiscent, included in or exserted from calyx, generally glandular
Seed 1
Species in genus: 9 species: sw US, Mex
Etymology: (Greek: scabshrub)
Reference: [Barneby 1977 Mem New York Bot Garden 27:21–54, 598–607]


P. fremontii (A. Gray) Barneby

Shrub < 1 m, generally silvery-strigose
Leaf: leaflets 3–25 mm, linear to ovate, generally jointed to axis, except uppermost
Inflorescence: raceme, ± open; pedicels with bractlets
Flower: calyx 5–9 mm, lobes unequal, < tube; corolla 7–9.5 mm, violet-purple
Fruit exserted, 7–10 mm, glabrous; small glands forming longitudinal lines
Chromosomes: 2n=20
Ecology: Granite and volcanic slopes, flats, canyons
Elevation: 250–1350 m.
Bioregional distribution: e Desert Mountains, e Sonoran Desert
Distribution outside California: to s Utah, Arizona
Like P. arborescens except in fruit, geography
Horticultural information: TRY.

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bioregional map for PSOROTHAMNUS%20fremontii being generated
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Psorothamnus fremontii
Retrieve dichotomous key for Psorothamnus
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