Lupinus bicolor |
Lupinus angustiflorus |
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bicolor lupine, field lupine, Lindley's annual lupine, Lindley's lupine, lupine, miniature lupine, Montana lupine, small-flower lupine, two-color lupine, two-colour lupine |
narrow flower lupine |
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Habit | Herbs, annual, 0.5–4 dm, pubescent. | Herbs, perennial, 5–12 dm, green, glabrous or sparsely hairy. |
Stems | ascending or erect, branched or unbranched. |
ascending-erect, branched. |
Leaves | cauline; petiole 1–7 cm; leaflets 5–8, blades 10–40 × 1–5 mm, adaxial surface glabrous or sparsely pubescent. |
cauline; stipules 5–13 mm; petiole 1–5 cm; leaflets 6–9, blades 20–60 × 4–8 mm, adaxial surface glabrous or with scattered hairs. |
Racemes | 4–20 cm; flowers usually in fewer than 5 whorls, sometimes spirally arranged. |
open, 6–34 cm; flowers spirally arranged. |
Peduncles | 3–10 cm; bracts deciduous, 4–6 mm. |
1–8 cm; bracts ± persistent, 3–7 mm. |
Pedicels | 1–3.5 mm. |
2–4 mm. |
Flowers | 4–10 mm; calyx abaxial lobe entire, 4–6 mm, adaxial lobe deeply cleft, 2–4 mm; corolla usually blue, rarely light blue, pink, or white, banner spot white, becoming magenta, upper keel margins usually ciliate near apex, rarely glabrous, sometimes blunt, banner longer than wide. |
8–10(–12) mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 4–9 mm, adaxial lobe 2-toothed, 4–8 mm; corolla usually pale yellow to orange-yellow, sometimes white, banner patch orange to yellow, keel tip pale lavender, banner usually hairy abaxially, keel glabrous. |
Legumes | 1–3 × 0.3–0.6 cm, pubescent. |
2.5–4 cm, hairy. |
Cotyledons | deciduous, petiolate. |
deciduous, petiolate. |
Seeds | 5–8. |
1–4, speckled tan and brown, 4.5–5.5 mm. |
2n | = 48. |
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Lupinus bicolor |
Lupinus angustiflorus |
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Phenology | Flowering late winter–spring (Mar–Jun). | Flowering Jun–Sep. |
Habitat | Open or disturbed areas. | Volcanic soils. |
Elevation | 0–1600 m. (0–5200 ft.) | 1000–3500 m. (3300–11500 ft.) |
Distribution |
AZ; CA; OR; WA; BC; Mexico (Baja California, Baja California Sur, Sonora)
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CA
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Discussion | Lupinus bicolor is naturalized in Arizona. The named subspecies and varieties do not conform to consistently recognizable geographical or morphological entities (D. B. Dunn 1955). Vigorous plants with larger flowers may be confused with L. nanus. In California, plants on the Outer North Coast Ranges may persist for two growing seasons. Lupinus bicolor (as L. polycarpus) has been reported from Alabama (A. R. Diamond 2016) and Michigan (E. G. Voss and A. A. Reznicek 2012). Lupinus micranthus Douglas (1829, not Gussone 1828) is an illegitimate name that pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Lupinus angustiflorus is known from the High Cascade Range, the northern and central High Sierra Nevada, and the Great Basin region of northeastern California. It is usually found on volcanic soils associated with yellow pine, red fir, lodgepole pine, and mountain hemlock forests. In Mono County, it is more commonly associated with sagebrush, bitterbrush, rabbitbrush, and wax currant. The persistent bracts, yellow flowers, and abaxial pubescence on the banner clearly separate this taxon from other species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Lupinus | Fabaceae > subfam. Faboideae > Lupinus |
Sibling taxa | ||
Synonyms | L. bicolor subsp. marginatus, L. bicolor var. micranthus, L. bicolor subsp. microphyllus, L. bicolor var. microphyllus, L. bicolor subsp. pipersmithii, L. bicolor var. pipersmithii, L. bicolor var. rostratus, L. bicolor subsp. tridentatus, L. bicolor var. tridentatus, L. bicolor var. trifidus, L. bicolor subsp. umbellatus, L. bicolor var. umbellatus, L. congdonii, L. polycarpus | L. andersonii var. christinae, L. christinae |
Name authority | Lindley: Bot. Reg. 13: plate 1109. (1827) | Eastwood: Leafl. W. Bot. 2: 226. (1940) |
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