Oxytropis nigrescens var. nigrescens
Oxytropis nigrescens var. lonchopoda
blackish locoweed, blackish oxytrope
blackish locoweed, Ogilvie Range locoweed
9–15, blade surfaces silvery-canescent, villous, strigose, or glabrous.
11–15, blade surfaces loosely pilose.
(1 or)2(–5)-flowered.
2-flowered.
1–4 cm.
0.3–2.1 cm.
tube usually villous-pilose, hairs black.
subsessile to short-stipitate, stipe 1.5–2 mm, shorter than calyx tube;
body usually strigulose to pilose or villous, rarely glabrous, hairs black.
stipitate, stipe 4–5 mm, subequal to calyx tube;
body ellipsoid to cylindroid, villous.
= 16.
Oxytropis nigrescens var. nigrescens
Oxytropis nigrescens var. lonchopoda
Variety nigrescens is a highly variable taxon in which green or silvery, loose or compact, and villous to strigose or even glabrous, plants often grow intermingled. Morphological intermediates between this variety and vars. lonchopoda and uniflora occur.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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