Lupinus arcticus |
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arctic lupine |
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Habit | Herbs, perennial, 1–4 dm, hairs thinly appressed silky-sericeous, or few to many and spreading; caudex superficial, divisions closely tufted. |
Stems | ascending to erect, hollow, tufted, branched at crown. |
Leaves | mostly basal with a few cauline proximal to inflorescences; stipules 8–10 mm; petiole 5–19 cm; leaflets 6–10, blades 13–90 × 10–15 mm, abaxial surface thinly strigose, adaxial surface glabrous. |
Racemes | 5–8(–15 in fruit) cm; flowers spirally arranged or in 3–7 whorls. |
Peduncles | 4–8.5 cm; bracts caducous to tardily deciduous, 8–14 mm. |
Pedicels | 4–6 mm. |
Flowers | 14–19(–21) mm; calyx bulge or spur 0–1 mm, abaxial lobe 6–11 mm, entire or faintly notched at tip, adaxial lobe ± gibbous basally, adaxial lobe teeth with slight notch at tip, 4–8 mm; corolla usually blue to purplish, sometimes pink, rarely white, banner spot white or yellow, sometimes becoming purple, banner glabrous abaxially, lower keel margins densely ciliate near claw or glabrous or sparsely ciliate towards tip, adaxial margin glabrous or sparsely ciliate towards tips. |
Legumes | 2–4.3 cm, silky-pilose. |
Cotyledons | deciduous, petiolate. |
Seeds | 5–8, mottled. |
2n | = 48. |
Lupinus arcticus |
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Phenology | Flowering Jun–Aug. |
Habitat | Well-drained hummocks of alpine and arctic tundra, moist to mesic meadows, gravel bars, clearings, roadsides, thickets, open forests. |
Elevation | 0–2000 m. (0–6600 ft.) |
Distribution |
AK; BC; NT; NU; YT
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Discussion | The relationship between Lupinus arcticus and L. latifolius is unclear. They may be distinguished by the presence of proximal keel ciliation in L. latifolius, and basal rather than cauline leaves dominating in L. arcticus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | |
Sibling taxa | |
Synonyms | L. borealis, L. donnellyensis, L. gakonensis, L. multicaulis, L. multifolius, L. nootkatensis var. kjellmannii, L. polyphyllus subsp. arcticus, L. toklatensis, L. yukonensis |
Name authority | S. Watson: Proc. Amer. Acad. Arts 8: 526. (1873) |
Web links |