20 Equisetum telmateja Ehrh.

Syn.: E. maximum auct.

This species s. lat. occurs in W., C. and S. Europe and adjacent parts of Africa and Asia. The population in N. America (with disjunct distribution) is distinguished as var. braunii Milde. The species s. lat. belongs to the amphi-atlantic plants (Hultén, Amphi-atl., p. 276 and map 258). Cf. also Meusel et al. 1965, map p. 7.