Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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.



Elizabeth McClintock

Shrub, tree; stipular spines generally 2 per node; roots long, spreading
Leaves even-2-pinnate, alternate, deciduous; 1° leaflets generally 1–2 pairs, opposite; 2° leaflets generally many, opposite
Inflorescence: raceme, axillary, spike-like or spheric head, many-flowered
Flower radial, small, greenish white or yellow; calyx shallowly bell-shaped, lobes very short; petals generally inconspicuous; stamens 10, exserted, free; style exserted, generally appearing before stamens
Fruit indehiscent, ± flat, ± narrowed between seeds or tightly coiled, pulpy when young, then woody
Seeds several
Species in genus: ± 44 species: especially Am (also sw Asia, Africa)
Etymology: (Greek: burdock, for obscure reasons)
Reference: [Burkhart 1976 J Arnold Arbor 57:220–524; Holland 1987 Madroño 34:324–333]
Used for timber, firewood, shade, ornamental, bee, human, and livestock food.


P. velutina Wooton

Shrub, tree < 15 m; crown ± spreading, rounded; hairs short, dense, on ± all parts, including fruit
Stem often crooked; spines 1–2 cm
Leaf: 1° leaflets 1–2 pairs, 2–9 cm; 2° leaflets generally 15–30 pairs, 4–15 mm, oblong, length 3–4 X width
Inflorescence: raceme, 5–15 cm, spike-like
Flower: petals free, 2–3 mm
Fruit 8–15 cm, linear, ± flat, barely narrowed between seeds
Seeds 5–7 mm, ovate
Chromosomes: 2n=28
Ecology: Uncommon. Sandy or rocky soils in canyons, washes
Elevation: < 1700 m.
Bioregional distribution: San Joaquin Valley, Central Coast, South Coast
Distribution outside California: native to sw US (except California), n Mexico

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bioregional map for PROSOPIS%20velutina 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 Prosopis velutina
Retrieve dichotomous key for Prosopis
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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