Hemerocallis n 1: east Asian rhizomatous clump-forming perennial herbs having flowers on long leafless stalks; cosmopolitan in cultivation: day lilies; sometimes placed in subfamily Hemerocallidaceae [syn: {Hemerocallis}, {genus Hemerocallis}]
Hemerocallis \Hem`e*ro*cal"lis\, n. [NL., fr. Gr. ?; ? day + ka`llos beauty.] (Bot.) A genus of plants, some species of which are cultivated for their beautiful flowers; day lily. [1913 Webster]