Jepson Flora Project: Jepson Interchange    

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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. emoryi (A. Gray) Rydb.

Subshrub < 1 m, < 2 m wide, generally canescent, (sometimes becoming glabrous); glands of twigs << 0.5 mm wide
Leaf: leaflets of middle leaves 5–9, 2–10 mm, narrowly oblong to obovate, terminal leaflet generally > others
Inflorescence spike-like, ovoid or spheric, dense; bractlets 0
Flower: calyx 4–7 mm, lobes ± = or > tube; corolla 4–6 mm, 2-colored (purple and white), puberulent
Fruit included, ± 2.5–3 mm
Chromosomes: 2n=20
Ecology: Desert flats, washes, dunes
Elevation: < 700 m.
Bioregional distribution: s Mojave Desert, Sonoran Desert
Distribution outside California: sw Arizona, Mexico
Flowering time: Mar–May
Synonyms: Dalea e. A. Gray
Horticultural information: DRN: 11, 12, 13.

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bioregional map for PSOROTHAMNUS%20emoryi being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Psorothamnus emoryi
Retrieve dichotomous key for Psorothamnus
Overlay Consortium of California Herbaria specimen data by county on this map
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