Flora of North America species comparison

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Oxytropis nigrescens var. nigrescens
Photo is of parent taxon

blackish locoweed, blackish oxytrope
Habit Plants densely cespitose to loosely matted, herbage green to silvery-canescent, villous, strigose, or glabrous.
Leaflets

9–15, blade surfaces silvery-canescent, villous, strigose, or glabrous.
Racemes

(1 or)2(–5)-flowered.
Peduncles

1–4 cm.
Calyx

tube usually villous-pilose, hairs black.
Legumes

subsessile to short-stipitate, stipe 1.5–2 mm, shorter than calyx tube;

body usually strigulose to pilose or villous, rarely glabrous, hairs black.
2n

= 16.

Oxytropis nigrescens var. nigrescens
Phenology Flowering summer.
Habitat Arctic and alpine tundra, coastal shores, gravel bars, rock outcrops.
Elevation 10–1800 m. (0–5900 ft.)
Distribution
from FNA
AK; BC; NT; YT; Asia (Kamchatka, Siberia)
[BONAP county map]
Discussion

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.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis nigrescens
Sibling taxa
O. nigrescens var. lonchopoda, O. nigrescens var. uniflora
Synonyms Aragallus nigrescens, O. bryophila, O. glaberrima, O. nigrescens subsp. bryophila, O. nigrescens var. bryophila, O. nigrescens subsp. pygmaea, O. nigrescens var. pygmaea, O. pygmaea, Spiesia nigrescens
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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