daylily

or day lil·y

[ dey-lil-ee ]
/ ˈdeɪˌlɪl i /

noun

any lily of the genus Hemerocallis, having yellow, orange, or red flowers that commonly last only for a day.

Origin of daylily

First recorded in 1590–1600

British Dictionary definitions for day lily

day lily

noun

any widely cultivated Eurasian liliaceous plant of the genus Hemerocallis, having large yellow, orange, or red lily-like flowers, which typically last for only one day and are immediately succeeded by others
the flower of any of these plants