516 Carex atrofusca Schkuhr

This arctic-montane species belongs to the circumpolar plants (Hultén, Circumpol. I, p. 46 and map 39). Three closely related taxa, described as separate species but more probably of subspecific rank, are tentatively mapped, viz. C. stilbophaea V. Krecz. in S. C. Siberia, C. oxyleuca V. Krecz. in C. Asiatic montains and C. podocarpa R. Br. in the Rocky Mts. Cf. also Meusel et al. 1965, map p. 76.