| Achillea millefolium subsp. borealis (Bong.) Breitung | |
| Publ. & Syn. | Achillea millefolium var. nigrescens E. Mey., Pl. Labrador.: 65 (1830). Described from Labrador (Canada). - Achillea nigrescens (E. Mey.) Rydb., N. Amer. Fl. 34, 3: 221 (1916). |
| Notes | The northern North American plants, both in Alaska and the Yukon Territory and in eastern Canada, seem to be morphologically closer to the North American subsp. lanuosa than to Eurasian plants of Achillea millefolium. |
| Chromosomes | (1) 36 (4x). - Alaska, Canada (E). - Hedberg (1967); Packer and McPherson (1974). (2) 54 (6x). - Alaska, Canada. - Several reports. |
| Geography | Amphi-Beringian - North American (N): RFE ALA CAN GRL. |
| Distribution | N = F AN = f C = ? GW = r D = F E = F CC = s HL = s CE = r AW = f GE = r CW = r [ key ] |
| Parent taxon | Achillea millefolium L. |
| PAF ID | 861401b |