| Betula divaricata Ledeb. | |
| Publ. & Syn. | Betula middendorffii Trautv. & C.A. Mey. in Middend., Reise Sibir. 1, 2, 3: 293 (1856). Holotype (LE)?: Russian Far East: the Okhotsk Sea, "in insula Schantar Magna", 06.-07. July 1844, leg. A. Middendorff. |
| Notes | Czerepanov (1966) accepted Betula divaricata without special comments, with B. middendorffii as synonym. Yurtsev commented that B. middendorffii is a good species, related to and vicariant for B. glandulosa in northeastern Asia. Hultén (1971a) interpreted B. middendorffii to be a hybrid between B. nana and some tree-forming species. Few or no such tree-forming species are present within the northern parts of its range but Hultén stated that: "The possibility for tree birch pollen to be transported a long way is illustrated by the fact, that hybrids with the tree-birches occur, although very rarely, on East Greenland, where no tree-birches occur." The reported chromosome numbers may indicate a hybrid background of at least parts of the counted material. |
| Chromosomes | (1) 42 (3x). - Siberia (N), Far East (N). - At least three reports. (2) ca. 48. - Siberia (N). - Zhukova et al. (1973). (2) 56 (4x). - Far East (N). - At least four reports. |
| Geography | Asian (NE): SIB RFE. |
| Distribution | N = F AO = ? D = R E = S CS = ? Kh = r CW = r Tm = b [ key ] |
| Parent taxon | Betula L. |
| PAF ID | 610211 |