Daylilies comprise the small genus Hemerocallis of flowering plants in the family Hemerocallidaceae. They are not true lilies which are Lilium in Liliaceae. Description These plants are Perennial. The name Hemerocallis comes from the Greek words ἡμέρα (hēmera) "day" and καλός (kalos) "beautiful". The flowers of most species open at sunrise and wither at sunset, possibly replaced by another one on the same stem the ne… (More on Hemerocallis)