815 Nuphar lutea (L.) Sibth. ex Sm.

This N. lutea complex includes N. lutea in Eurasia, N. polysepala Engelm. in northwestern N. America and N. variegata Engelm. in central and eastern N. America. The complex has a circumpolar distribution (Hultén, Circumpol. Il, p. 376 and map 158). Cf. also Meusel et al. 1965, map p. 153.