| Fabaceae | |
Oxytropis nigrescens fo. albida
| Lepage | Amer. Midl. Naturalist 46(3): 758 | 1951 [1952] |
| Fabaceae | |
Oxytropis nigrescens subsp. arctobia
| (Bunge) Hultén | Ark. Bot., n.s. 7(1): 80 | 1967 [1968] |
| Fabaceae | |
Oxytropis nigrescens var. arctobia
| (Bunge) A. Gray | Proc. Amer. Acad. Arts 20: 3 | 1884 |
| Fabaceae | |
Oxytropis nigrescens fo. bryophila
| | | |
| Fabaceae | |
Oxytropis nigrescens subsp. bryophila
| (Greene) Hultén | Fl. Alaska Yukon 7: 1102 | 1947 |
| Fabaceae | |
Oxytropis nigrescens var. bryophila
| (Greene) Lepage | Amer. Midl. Naturalist 46(3): 758 | 1951 [1952] |
| Fabaceae | ** |
Oxytropis nigrescens fo. genuina
| Kjellm. | Vega-Exped. Vetensk. Arb. 16 | 1883 |
| Fabaceae | |
Oxytropis nigrescens subsp. lonchopoda
| (Barneby) Cody | Canad. Field-Naturalist 108(1): 94 | 1994 |
| Fabaceae | |
Oxytropis nigrescens var. lonchopoda
| Barneby | Leafl. W. Bot. 10(2): 23 | 1963 |
| Fabaceae | |
Oxytropis nigrescens fo. nigrescens
| | | |
| Fabaceae | |
Oxytropis nigrescens subsp. nigrescens
| | | |
| Fabaceae | ! |
Oxytropis nigrescens var. nigrescens
| | | |
| Fabaceae | |
Oxytropis nigrescens subsp. pygmaea
| (Pall.) Hultén | Fl. Alaska Yukon 7: 1103 | 1947 |
| Fabaceae | |
Oxytropis nigrescens var. pygmaea
| (Pall.) Cham. | Linnaea 6(4): 546 | 1831 |
| Fabaceae | ! |
Oxytropis nigrescens var. uniflora
| (Hook.) Barneby | Proc. Calif. Acad. Sci., ser. 4, 27(7): 209 | 1952 |