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

  • 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.


Richard Spellenberg

Annual or perennial herb from crown, glabrous to hairy; hairs sometimes forked at base, branches parallel with leaf surface, sometimes very unequal
Stem 0 or prostrate to erect
Leaves odd-1-pinnate; leaflets generally jointed to midrib; stipules membranous, sometimes fused around stem at stem base
Inflorescence: raceme, axillary, sometimes head- or umbel-like; flowers 2–many
Flower bilateral; calyx 5-lobed; banner outside wings in bud, keel blades with small protrusion at base locking into pit on adjacent wing; 9 filaments fused, 1 free; ovary (and fruit) generally sessile, style slender, stigma minute
Fruit generally 1- or ± 2-chambered, often mottled, generally becoming ± dry; placenta on upper suture
Seeds 2–many, smooth, compressed, ± notched at attachment scar
Species in genus: > 2000 species: ± worldwide (380 in North America, 94 in CA including many rare taxa)
Etymology: (Greek: ankle-bone or dice, perhaps from rattling of seeds within fruit)
Reference: [Barneby 1964 Mem NY Bot Gard 20:1–1188; Isely 1986 Iowa State J Res 61:157–289]
Very difficult; both flower and fruit needed for identification; many good species appear similar; some species complexes need study. Taxa near province boundaries may appear in > 1 key. Varieties keyed under species for simplicity; species with vars. so identified in key. Fr length includes beak and any stalk-like base unless fruit body specified.


A. trichopodus (Nutt.) A. Gray

Perennial, robust, bushy-branched, ± minutely strigose, generally also spreading-hairy
Stem ± erect, 2–10 dm
Leaf 2.5–20 cm; lower stipules rarely fused around stem into sheath; leaflets 15–39, 2–25 mm, ± lanceolate
Inflorescence: flowers 10–50, spreading or reflexed
Flower: calyx 5–8.7 mm, tube 3.6–5.4 mm; petals ± cream, sometimes faintly lilac-blushed or -lined, banner 11.3–19 mm, recurved 40–45°, keel 8.6–13.7 mm
Fruit pendent; body 13–45 mm, 4.8–21 mm wide, linear-elliptic and compressed side-to-side to ovate and bladdery, persistent, thinly papery; hairs minute, sparse; dehiscence from tip, along top suture; stalk-like base 5–17 mm, slender, strigose or ± glabrous, joint between body base and stalk 0; chamber 1; immature seeds 10–30
Ecology: Open, grassy areas, bluffs, rocky sites
Elevation: 0–1220 m.
Bioregional distribution: s South Coast Ranges, South Coast, Channel Islands, Western Transverse Ranges, w Peninsular Ranges, w edge Mojave Desert
Distribution outside California: Baja California
Like A. asymmetricus, A. curtipes, A. oxyphysus , but note calyx length; stalk length, hairs, position of joint; ovule number.


var. lonchus (M.E. Jones) Barneby

Inflorescence: flowers 12–36
Flower: banner 11.3–19 mm; keel 8.6–13 mm
Fruit: body 17–45 mm, 8–21 mm wide, bladdery, with very convex sides, hairy n of San Diego, sometimes glabrous s; upper suture much less convex than lower
Chromosomes: 2n=22
Ecology: Coastal bluffs, fields
Elevation: < 300 m.
Bioregional distribution: South Coast, n Channel Islands, w Peninsular Ranges
Distribution outside California: Baja California
Synonyms: A. leucopsis (Torr.) Torr. & A. Gray

previous taxon | next taxon
bioregional map for ASTRAGALUS%20trichopodus%20var.%20lonchus being generated

Retrieve Jepson Interchange Index to Plant Names entry for Astragalus trichopodus var. lonchus
Retrieve dichotomous key for Astragalus
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
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California