511 Carex glacialis Mack.

This arctic species is widely distributed in Eurasia and N. America. In C. Asia and locally in western N. America it can be characterized as a montane species. It belongs to the circumpolar plants (Hultén, Circumpol. I, p. 30 and map 23). There seems, however, to be a gap in the River Kolyma area in E. Siberia.