Lupinus pusillus |
Lupinus formosus |
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intermountain lupine, low lupine, rusty lupine |
summer lupine, western lupine |
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Habit | Herbs, annual, 0.5–2 dm, sparsely pubescent to pilose, hairs more than 1 mm. | Herbs, perennial, 12–8 dm, densely hairy to tomentose, gray to silver; rhizomes 3–7 mm diam. | ||||||||||||
Stems | short and tufted or erect, branched from base or near middle. |
ascending, spreading, or erect, branched. |
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Leaves | cauline, often crowded near base; stipules well developed; petiole 1–9 cm; leaflets 5–9, blades 10–40 × 5–10 mm, adaxial surface glabrous. |
cauline; stipules not leaflike, green to silvery, 4–15 mm; petiole 2–7 cm; leaflets 7–9, blades 25–70 × 6–14 mm, adaxial surface pubescent. |
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Racemes | 8–12-flowered, 2–11 cm, shorter than or slightly exceeding foliage; flowers spirally arranged. |
10–30 cm; flowers ± whorled. |
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Peduncles | 0–3.5 cm; bracts persistent, straight, 2–5 mm. |
3–7 cm; bracts deciduous, 4–14 mm. |
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Pedicels | 1–3.5 mm. |
3–7 mm. |
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Flowers | 5–12 mm; calyx abaxial lobe entire, 5–6 mm, adaxial lobe cleft, 2.5–4 mm; corolla vivid blue, sometimes paler or white, sometimes bicolored, banner spot white or yellowish, keel glabrous. |
10–18 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 8–12 mm, adaxial lobe 2-toothed, 7–11 mm; corolla purple, banner patch white or not, banner glabrous abaxially, keel upcurved, glabrous, banner ovate, wings wide, covering keel tip. |
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Legumes | 1.5 cm, constricted between seeds, thinly pilose to coarsely hirsute. |
3–4.5 cm, hairy. |
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Cotyledons | persistent, disclike, sessile. |
deciduous, petiolate. |
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Seeds | 2, wrinkled or ridged. |
5–7, mottled brown, 4–7 mm. |
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Lupinus pusillus |
Lupinus formosus |
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Distribution |
w North America; c North America
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nw Mexico; California
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Discussion | Varieties 3 (3 in the flora). Lupinus pusillus is a highly variable species, with the varieties intergrading. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Lupinus | Fabaceae > subfam. Faboideae > Lupinus | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Name authority | Pursh: Fl. Amer. Sept. 2: 468. 1814[1813] | Greene: Fl. Francisc., 42. (1891) | ||||||||||||
Web links |
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