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.



Rhonda Riggins (annual) and Teresa Sholars (perennial herbs to shrubs)

Annual to shrubs; cotyledons generally petioled, withering early
Stem generally erect
Leaves palmately compound in CA, generally cauline; stipules fused to petiole; leaflets 3–17, generally oblanceolate, entire
Inflorescence: raceme; flowers spiraled or whorled; bracts generally deciduous
Flower: calyx 2-lipped, lobes entire or toothed, generally appendaged between lobes; banner centrally grooved, sides reflexed, wing tips slightly fused, keel generally pointed; stamens 10, filaments fused, 5 long with short anthers, 5 short with long anthers; style brushy
Fruit dehiscent, generally oblong
Seeds 2–12, generally smooth
Species in genus: ± 200 species: especially w North America, w South America to e US, also tropical South America, Medit
Etymology: (Latin: wolf, from mistaken idea that plants rob soil of nutrients)
Some cultivated for fodder, green manure, edible seed, ornamental; some naturalized from CA in e North America, South America, Australia, s Africa; some (e.g. L. arboreus, L. latifolius, L. leucophyllus ) have alkaloids (especially in seeds, fruits, young herbage) TOXIC to livestock (especially sheep)
Reference: [Barneby 1989 Intermountain Flora 3(B):237–267]
Infl length does not include peduncle
Horticultural information: Many lupine taxa need seed pre-treatment (scarification, stratification, inoculation) for successful germination.


L. microcarpus Sims


Annual 1–8 dm, sparsely to densely hairy; cotyledons disk-like, persistent, or leaving a circular scar
Leaf: petiole 3–15 cm; leaflets 5–11, generally 9, 10–50 mm, 2–12 mm wide, sometimes linear, upper surface glabrous
Inflorescence 2–30 cm; peduncle 2–30 cm; bracts 3.5–12 mm, reflexed, persistent; pedicels 0.5–5 mm
Flower 8–18 mm; calyx upper lip 2–6 mm, lower lip 5–10 mm, appendages generally 0; petals white to dark yellow, pink to dark rose, or lavender to purple, wings generally ciliate on upper (less often lower) margins near claw, upper keel margins ciliate, lower keel margins less so or glabrous near claw
Fruit 1–1.5 cm, ± 10 mm wide, ovoid, hairy, erect to spreading, often on 1 side of inflorescence axis
Seeds 2, tan to brown, generally mottled, wrinkled or smooth
Chromosomes: 2n=48
Ecology: Abundant. Open or disturbed areas, sometimes seeded on roadbanks
Elevation: < 1600 m.
Bioregional distribution: California Floristic Province, Modoc Plateau, w Mojave Desert
Distribution outside California: to British Columbia, Baja California, S.America
Highly variable; vars. intergrade.


var. horizontalis (A. Heller) Jeps.

Inflorescence: bracts short- to long-spreading-hairy
Flower: calyx appressed- to spreading-hairy, appendages 1–2 mm; petals lavender to purple, becoming translucent, wings widely elliptic, persistent, ciliate on upper (and generally lower) margins near claw, lower keel margins ciliate near claw
Ecology: Washes, sand or gravel
Elevation: < 1500 m.
Bioregional distribution: s San Joaquin Valley, eastern Mojave Desert
Flowering time: Apr–May
Synonyms: L. h. A. Heller including var. platypetalus C.P. Sm.; L. arenicola A. Heller; L. densiflorus Benth. var. glareosus (Elmer) C.P. Sm
Horticultural information: TRY.

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bioregional map for LUPINUS%20microcarpus%20var.%20horizontalis being generated

Retrieve Jepson Interchange Index to Plant Names entry for Lupinus microcarpus var. horizontalis
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