Day-lily (Hemerocallis), a perennial herbaceous genus of Liliaceæ, so named from the ephemeral duration of its individual flowers, which, however, succeed each other freely upon the peculiar inflorescence (a helicoid cyme). Several species are cultivated in our flower-gardens, especially the fragrant Yellow Day-lily (H. flava), a native of warmer Europe, Southern Siberia, and Northern China, and H. fulva, from the Levant. Both species, but particularly the latter, have been recommended as sources of green fodder for cattle.