| Euphrasia hudsoniana Fernald & Wiegand | |
| Publ. & Syn. | Fernald & Wiegand, Rhodora 17: 194 (1915). Holotype (GH): Canada: Quebec, Ungava, Spreadborough, Koaksoak River, Aug. 1896, leg. M.L. Fernald and K.M. Wiegand. |
| Notes | Euphrasia hudsoniana is distributed from Labrador west to Lake Winnipeg (Sell and Yeo 1970) and with arctic occurrences in northern Labrador (Nain), Ungava, and along Hudson Bay. It is characterized by having conspicuously longer hairs on leaves and calyx than the majority of northern Euphrasias but only with eglandular hairs, with first flowers at comparatively low nodes (4.-6. node), leaves more or less sharply dentate, flowers comparatively large and white-lilac, calyx with blackish spots (as in E. wettsteinii), and the capsule more or less equalling the calyx in length. |
| Chromosomes | 44 (4x). - Greenland. - Jørgensen et al. (1958, for E. arctica); Holmen in Löve and Löve (1961d, for E. arctica subsp. borealis). Assignment of these reports to this species needs re-evaluation. |
| Geography | North American (NE): CAN. |
| Distribution | N = S E = R HL = r [ key ] |
| Parent taxon | Euphrasia L. |
| PAF ID | 810409 |