Flora of North America species comparison

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Oxytropis nigrescens var. uniflora

Oxytropis nigrescens var. nigrescens
Photo is of parent taxon

one-flower blackish locoweed, one-flower oxytrope
Photo is of parent taxon

blackish locoweed, blackish oxytrope
Habit Plants densely cespitose or pulvinate, herbage densely silky-villous, caudex branches often becoming columnar. Plants densely cespitose to loosely matted, herbage green to silvery-canescent, villous, strigose, or glabrous.
Leaflets

5–11, blade surfaces densely silky-canescent.

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

1- or 2-flowered.

(1 or)2(–5)-flowered.
Peduncles

0.3–2.1 cm.

1–4 cm.
Calyx

tube usually villous-pilose, hairs black.
Legumes

usually subsessile, sometimes short-stipitate, stipe to 2 mm, shorter than calyx tube;

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

= 16.

Oxytropis nigrescens var. uniflora

Oxytropis nigrescens var. nigrescens
Phenology Flowering summer. Flowering summer.
Habitat Arctic tundra, coastal shores, gravel bars, rock outcrops. Arctic and alpine tundra, coastal shores, gravel bars, rock outcrops.
Elevation 10–1500 m. (0–4900 ft.) 10–1800 m. (0–5900 ft.)
Distribution
from FNA
AK; BC; NT; NU; QC; YT
[BONAP county map]
from FNA
AK; BC; NT; YT; Asia (Kamchatka, Siberia)
[BONAP county map]
Discussion

Variety uniflora, as treated here, is a North American endemic and is of conservation concern in British Columbia; it was treated as Oxytropis arctobia by Z. Meyer (2012). Oxytropis gorodkovii Jurtzev from the Chukchi Peninsula of the Russian Far East matches it in every way. The Siberian specimens seem to represent ecological variants within var. nigrescens. The online Pan-Arctic Flora (http://panarcticflora.org/) considers the material treated here as var. uniflora to be two distinct species: O. gorodkovii and O. arctobia.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis nigrescens Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis nigrescens
Sibling taxa
O. nigrescens var. lonchopoda, O. nigrescens var. nigrescens
O. nigrescens var. lonchopoda, O. nigrescens var. uniflora
Synonyms O. arctica var. uniflora, Astragalus nigrescens var. arctobia, O. arctobia, O. nigrescens subsp. arctobia, O. nigrescens var. arctobia, Spiesia arctobia 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 (Hooker) Barneby: Proc. Calif. Acad., ser. 4, 27: 209. (1952) 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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