| Micranthes nelsoniana (D. Don) Small | |
| Publ. & Syn. | Saxifraga punctata auct., non L. (1753). |
| Notes | Hultén and Fries (1986) mapped this species to reach the Arctic with three nearly allopatric races: the amphi-Beringian subsp. nelsoniana, the northern and central Asian subsp. aestivalis with an eastern boundary more or less along the Kolyma River, and the coastal amphi-Pacific subsp. insularis. Zhmylev stated subsp. nelsoniana and subsp. aestivalis to be largely sympatric in Siberia and with much transitions (and therefore as subspecies) but with subsp. aestivalis more southern than subsp. nelsoniana. We follow that view. The differential characters do not seem to be adaptive. Treatment as subspecies seems appropriate. |
| Chromosomes | 20 (2x). - Alaska, Canada (NW). - At least three reports. Krause and Beamish (1973) reported 2n = 20, ca. 30, and 40 for Saxifraga reflexa. Brouillet and Elvander (2009a) accepted 2n = 20 and 40, whereas they accepted the related, more southern Micranthes occidentalis (S. Watson) Small to be chromosomally more varied (2n = 20, 38, 40, 56, 58). |
| Geography | Asian (N/C) - amphi-Pacific/Beringian. |
| Parent taxon | Micranthes Haw. |
| Child taxa |
Micranthes nelsoniana subsp. aestivalis (Fisch. & C.A. Mey.) Elven & D.F. Murray Micranthes nelsoniana subsp. insularis (Hultén) Elven & D.F. Murray Micranthes nelsoniana subsp. nelsoniana |
| PAF ID | 500111 |