948 Draba alpina L.

This arctic, partly arctic-montane species forms together with related taxa an intricate group of more or less arctic distribution (see Fl. Eur. 1/1964, p. 310). D. alpina belongs to the circumpolar plants (Hultén, Circumpol. Il, p. 62 and map 53). In C. Asia a number of closely related taxa are distinguished, of which D. ochroleuca Bge is tentatively mapped here, as is also D. lemmonii Wats. in mountains of California and Oregon. For D. gredinii E. Ekm. see no. 949.