1770 Erigeron acer L. subsp. acer

This Eurasiatic subspecies belongs to a complex of more or less well-defined taxa. Fl. Eur. 4/1976, p. 118 distinguishes, besides subsp. acer and two doubtful subspecies, four subspecies, each with rather distinct distribution areas (cf. no. 1771 and Hultén, Circumpol. Il, p. 288). Subsp. acer has, together with var. debilis Gray in northwestern North America and E. elatus Greene throughout Canada, a circumpolar distribution (Hultén, I. cit.).