Oxytropis lagopus
Oxytropis nigrescens
hare oxytrope, haresfoot locoweed
blackish locoweed, blackish oxytrope, one-flower oxytrope
1–10 cm;
stipules membranous, soon ruptured, light becoming dark in age, silky-pilose, margins ciliate;
leaflets 5–17, scattered or congested, blades ovate-oblong to narrowly elliptic, 3–15 × 2–6 mm, apex acute or obtuse, surfaces pilose or sericeous.
0.5–5 cm;
stipules membranous, whitish or with light tan or grayish herbaceous tips, 5–14 mm, usually ± pilose, rarely glabrous abaxially, margins often long-ciliate, with clavate processes;
leaflets 5–15, blades elliptic to ovate, 2–10 × 1–2(–3) mm, flat, margins involute but not falcate, apex acute or obtuse, surfaces silky- or silvery-canescent, villous, strigose, or loosely pilose, rarely glabrous.
(3–)5–18-flowered, subcapitate or slightly elongate.
1 or 2(–5)-flowered.
1–13 cm, axis 0.5–3(–4) cm in fruit, appressed-pilose to villous-hirsute;
bract ovate-lanceolate to lanceolate, margins involute, shaggy-pilose.
0.3–4[–5] cm, pubescent;
bract narrowly lanceolate to linear, pilose.
bright pink-purple or bluish purple, 15–19(–20) mm.
bright pink-purple or blue-purple to white, 12–20 mm.
deeply campanulate, villous to shaggy-villous, hairs mixed blackish and white, appearing gray, 2 mm;
tube 5.5–7 mm, slightly swollen to strongly inflated, variably accrescent, ruptured by fruit or not, lobes 2–4.5 mm.
campanulate, usually black-pilose, sometimes villous, strigose, or glabrous;
tube 3–6 mm, lobes 1.8–4 mm.
enclosed in or exserted from calyx, erect, sessile or short-stipitate, ovoid to narrowly oblong, turgid to inflated, 6–15(–20) × 4–6.5 mm, bilocular, papery to nearly membranous, white- or black-villous.
spreading, subsessile to short-stipitate or stipitate, stipe 1.5–5 mm, oblong-ellipsoid, 18–38(–40) × 8–11 mm, unilocular or subunilocular, usually strigulose to pilose or villous, rarely glabrous.
Oxytropis lagopus
Oxytropis nigrescens
Varieties 3 (3 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The Pan-Arctic Flora (http://panarcticflora.org/) splits the Oxytropis nigrescens complex into multiple species. It does not recognize O. nigrescens in the narrow sense as present in North America, restricting that species to Asia; instead, O. arctobia, O. bryophila and O. czukotica Jurtzev (not treated here) are considered present in North America. The Pan-Arctic Flora does not address the status of O. nigrescens var. lonchopoda because it grows outside the region they considered.
Varieties 3 (3 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaflets 7 or 9(–13), congested on rachis, rachis about equaling longest leaflet; sw Alberta, w Montana. | var. conjugans |
1. Leaflets 11–17, well-distributed on rachis, rachis longer than longest leaflet; Idaho, Montana, South Dakota, Wyoming. | → 2 |
2. Calyces becoming swollen, accrescent in fruit; legumes falling enclosed within calyx prior to dehiscence; Idaho, Montana, n Wyoming. | var. lagopus |
2. Calyces slightly swollen or not accrescent in fruit; legumes usually persisting on plant within calyx until after dehiscence; s Montana, South Dakota, Wyoming. | var. atropurpurea |
1. Legumes long-stipitate, stipes 4–5 mm, subequal to calyx tube; Ogilvie Mountains, Yukon. | var. lonchopoda |
1. Legumes subsessile to short-stipitate, stipes 1.5–2 mm, shorter than calyx tube; Alaska, British Columbia, Northwest Territories, Nunavut, Quebec, Yukon. | → 2 |
2. Leaflets 9–15, blade surfaces silvery-canescent, villous, strigose, or glabrous; Alaska, British Columbia, Northwest Territories, Yukon. | var. nigrescens |
2. Leaflets 5–11, blade surfaces densely silky-canescent; alpine in s Yukon and n British Columbia, coastal from Mackenzie Delta eastward. | var. uniflora |
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USDA Plants Database
BC
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