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A new species of the genus oxytropis from the section baicalia fabaceae and the problem of continental relicts in the flora of wrangel island russian sfsr ussr



A new species of the genus oxytropis from the section baicalia fabaceae and the problem of continental relicts in the flora of wrangel island russian sfsr ussr



Botanicheskii Zhurnal (St Petersburg) 73(12): 1649-1661



The description of a new species Oxytropis uniflora from the section Baicalia of the Wrangel Island flora is presented. It is closely related to O. putoranica from the eastern regions of the Putorana plateau and Byrranga mountains (the North of Middle Siberia). These two species form a separate (new) subsection Uniflorae which is most closely connected to the South-Siberian- North-Mongolian-Middle-Asian alpine subsection Chinobiae. The penetration of an alpine ancestor of the northern group to the Putorana from the Altai Mountains, as well as a later dispersal of O. putoranica, to the eastern Taimir Peninsular and, farther, to the Wrangel Island area (via the exposed polar shelf), seem to have occurred in the cryo-aridic intervals of the Middle and Late Pleistocene under the conditions of ultracontinental climate and extremely poor-in-snow winters. A refuge of continental cryophilic species of legumes has been discovered in the centre of the island (on a low carbonate-sandstone ridge in the middle of a wide intermontane depression, in the upper reaches of the Neizvestnaya River), with the only locations (within the island) of Hedysarum dasycarpum and endemic Oxytropis uniflora, the second locations of Astragalus pseudadsurgens and A. tugarinovii.

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Accession: 006954575

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