17 Equisetum sylvaticum L.

This not very variable species is widely distributed in Eurasia and N. America. For large areas, especially parts of Siberia, the reports are too few or inaccurate for more precise mapping. It belongs to the circumpolar plants (Hultén, Circumpol. I, p. 94 and map 86). Cf. also Meusel et al. 1965, map p. 7.