523 Carex hostiana DC.

Syn.: C. hornschuchiana Hoppe

This mainly European species has a subatlantic distribution tendency. The population in easternmost N. America is distinguished as var. laurentiana Fem. & Wieg. Thus, the species belongs to the circumpolar plants (Hultén, Circumpol. I, p. 154 and map 136). There are, however, a few localities of typical C. hostiana in N. America, probably introduced. Cf. also Meusel et al. 1965, map p. 77.