| Achillea millefolium subsp. lanulosa (Nutt.) Piper | |
| Publ. & Syn. | Piper, Fl. Washington: 584 (1906). - Achillea lanulosa Nutt., J. Acad. Nat. Sci. Philadelphia 7: 36 (1834). Holotype (PH): U.S.A.: Idaho, banks of Kooskoosky [Clearwater] River, leg. Lewis. |
| Notes | Subspecies lanulosa is adventive but established in Narssarssuaq in southwestern Greenland (Pedersen 1972). The Löves sorted the chromosome reports: 2n = 36 on Achillea lanulosa and 2n = 54 on A. borealis. Incidentally, they also assigned only counts of 2n = 54 to A. millefolium ('s. str.' in their concept). There is little reason to assume that the chromosomal situation is as simple as designed by the Löves. In 2010, Icelandic material was found to include both Achillea millefolium s. str. (predominant) and subsp. lanulosa (interior and northern parts). The difference in morphology was pronounced, and the two morphological types co-occurred in some sites. There is little reason to assume that the "lanulosa" type is introduced in Iceland. However, the "lanulosa" type has not yet been proved from the arctic parts of Iceland. |
| Chromosomes | (1) 36 (4x). - Canada, U.S.A. - Numerous reports. (2) 54 (6x). - U.S.A. (SW). - Chuang in Heckard and Hickman (1984, for A. lanulosa subsp. lanulosa). |
| Geography | North American - amphi-Atlantic?: CAN GRL*. |
| Distribution | N = F AN = ? GW = * E = R HL = r [ key ] |
| Parent taxon | Achillea millefolium L. |
| PAF ID | 861401c |