Oxytropis nigrescens var. lonchopoda
Oxytropis nigrescens
blackish locoweed, Ogilvie Range locoweed
blackish locoweed, blackish oxytrope, one-flower oxytrope
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.
11–15, blade surfaces loosely pilose.
2-flowered.
1 or 2(–5)-flowered.
0.3–2.1 cm.
0.3–4[–5] cm, pubescent;
bract narrowly lanceolate to linear, pilose.
bright pink-purple or blue-purple to white, 12–20 mm.
campanulate, usually black-pilose, sometimes villous, strigose, or glabrous;
tube 3–6 mm, lobes 1.8–4 mm.
stipitate, stipe 4–5 mm, subequal to calyx tube;
body ellipsoid to cylindroid, 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 nigrescens var. lonchopoda
Oxytropis nigrescens
There is considerable variation in stipe length through the range of Oxytropis nigrescens. The localization of an elongated stipe in var. lonchopoda, known only from the Ogilvie Mountains, demonstrates a coincidence of that feature with the similar O. podocarpa, whose fruit is much more inflated and in which the leaflets are usually falcate.
(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. 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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