Lupinus pusillus |
Lupinus apertus |
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intermountain lupine, low lupine, rusty lupine |
naked lupine, summit lupine |
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| Habit | Herbs, annual, 0.5–2 dm, sparsely pubescent to pilose, hairs more than 1 mm. | Herbs, perennial, 2–6 dm, green, puberulent to sparsely appressed-hairy. | ||||||||
| Stems | short and tufted or erect, branched from base or near middle. |
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 5–10 mm; petiole 2–5 cm; leaflets 7–9, blades 25–55 × 4–12 mm, adaxial surface pubescent. |
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| Racemes | 8–12-flowered, 2–11 cm, shorter than or slightly exceeding foliage; flowers spirally arranged. |
8–11 cm; flowers spirally arranged to whorled. |
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| Peduncles | 0–3.5 cm; bracts persistent, straight, 2–5 mm. |
1–8 cm; bracts deciduous, 3.5–5 mm. |
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| Pedicels | 1–3.5 mm. |
3–6 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. |
10–12 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 4.5–7 mm, adaxial lobe 2-toothed, 3.5–6 mm; corolla usually purple, sometimes pink or white, banner patch usually white, banner hairy abaxially, keel glabrous. |
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| Legumes | 1.5 cm, constricted between seeds, thinly pilose to coarsely hirsute. |
2–3 cm, hairy. |
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| Cotyledons | persistent, disclike, sessile. |
deciduous, petiolate. |
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| Seeds | 2, wrinkled or ridged. |
3 or 4, 5–6 mm. |
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Lupinus pusillus |
Lupinus apertus |
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| Phenology | Flowering Jun–Jul. | |||||||||
| Habitat | Dry, rocky soils. | |||||||||
| Elevation | 1500–3000 m. [4900–9800 ft.] | |||||||||
| Distribution |
w North America; c North America
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CA; NV |
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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.) |
Lupinus apertus is found in the northern High Sierra Nevada from Plumas to El Dorado counties in California and eastward to southwestern Washoe County, Nevada. Lupinus apertus can be differentiated from L. andersonii by its abaxial banner pubescence and from L. angustiflorus by its pale yellow to orange-yellow flowers. Lupinus apertus is reportedly toxic. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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| Key |
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| Synonyms | L. andersonii var. apertus | |||||||||
| Name authority | Pursh: Fl. Amer. Sept. 2: 468. 1814[1813] | A. Heller: Muhlenbergia 8: 103, fig. 15. (1912) | ||||||||
| Source | FNA vol. 11. | FNA vol. 11. | ||||||||
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