Lupinus arbustus |
Lupinus microcarpus |
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grassland lupine (ssp. neolaxiflorus), long-spur lupine, Montana lupine (ssp. pseudoparviflorus), spur lupine |
chick lupine, wide-bannered lupine |
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Habit | Herbs, perennial, 2–7 dm, green or gray-silky. | Herbs, annual, 1–8 dm, sparsely to densely pubescent. | ||||||||
Stems | erect, ascending, or decumbent, branched. |
ascending or erect, branched near base or middle, or unbranched, hollow, at least near base. |
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Leaves | cauline and basal; stipules 4–9 mm; petiole 2–16 cm; leaflets 7–10(–13), blades 20–70 × 3–15 mm, adaxial surface strigose. |
cauline; petiole 3–15 cm; leaflets 5–9(–11), blades 10–50 × 2–12 mm, adaxial surface glabrous. |
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Racemes | open, 3–18 cm; flowers whorled. |
4–60 cm; flowers in crowded to widely spaced whorls. |
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Peduncles | 2–5 cm; bracts deciduous, 3–6 mm. |
2–30 cm; bracts persistent, reflexed, 3.5–12 mm. |
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Pedicels | 1–7 mm. |
0.5–5 mm. |
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Flowers | 8–14 mm; calyx spur distinct, 1–3 mm, abaxial lobe 3-toothed, 2.5–5 mm, 1–3 mm, adaxial lobe 2-toothed, 2–4 mm; corolla blue, purple, pink, white, or yellowish, banner patch white, yellowish, or absent, banner hairy abaxially, wings with dense hair patch outside near tip, lower keel margins glabrous, adaxial margin ciliate. |
8–18 mm; calyx appendages usually absent, sometimes present, abaxial lobe 5–11 mm, adaxial lobe 2–6 mm; corolla white to dark yellow, pink to dark rose, or lavender to purple, lower wing margins sometimes ciliate, upper margins usually ciliate near claw, upper keel margins usually ciliate near claw, lower margins sometimes ciliate but not as densely. |
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Legumes | 2–3 cm, silky. |
1–1.8 cm, pubescent. |
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Cotyledons | deciduous, petiolate. |
persistent or deciduous (leaving circular scar), disclike, sessile. |
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Seeds | 3–6, tan, 5–6 mm. |
2, tan to brown, usually mottled, ridged or smooth. |
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Lupinus arbustus |
Lupinus microcarpus |
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Phenology | Flowering May–Jul. | |||||||||
Habitat | Open sagebrush scrub or mixed-conifer forests. | |||||||||
Elevation | 1500–3000 m. [4900–9800 ft.] | |||||||||
Distribution |
CA; ID; MT; OR; UT; WA; BC
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w North America; nw Mexico; South America
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Discussion | Lupinus arbustus is known from the Cascade and Klamath ranges, San Gabriel Mountains, Sierra Nevada, and the Great Basin area in California; Owyhee Desert in Idaho and Oregon; eastern Washington and western Montana; and western Juab and Tooele counties, Utah. Lupinus arbustus is separated from the argenteus group by the presence of hairs on the corolla wings. Recognition of subspecies and varieties of this already complex species leads to precarious separation among taxa. Lupinus variegatus A. Heller (1912, not Poiret 1814) is an illegitimate name that pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 3 (3 in the flora). Lupinus microcarpus is highly variable and with varieties intergrading. (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 | ||||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | L. arbustus subsp. calcaratus, L. arbustus var. montanus, L. arbustus subsp. neolaxiflorus, L. arbustus subsp. pseudoparviflorus, L. arbustus subsp. silvicola, L. caesius, L. caudatus var. submanens, L. caudatus var. subtenellus, L. elegantulus, L. inyoensis var. demissus, L. laxiflorus var. calcaratus, L. laxiflorus var. cognatus, L. laxiflorus var. elmerianus, L. laxiflorus var. lyleianus, L. laxiflorus var. pseudoparviflorus, L. laxiflorus var. silvicola, L. laxiflorus var. villosulus, L. lyleianus, L. mucronulatus var. umatillensis, L. multitinctus, L. noldekeae, L. proteanus, L. pseudoparviflorus, L. silvicola, L. wenatchensis, L. yakimensis | |||||||||
Name authority | Douglas: Edwards’s Bot. Reg. 15: plate 1230. (1829) | Sims: Bot. Mag. 50: plate 2413. (1823) | ||||||||
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