day lily

  1. any of a genus (Hemerocallis) of plants of the lily family, with showy, trumpet-shaped flowers, usually opening for a single day
  2. plantain lily

See day lily in American Heritage Dictionary 4

or day·lil·y

noun
Any of several perennial Eurasian herbs of the genus Hemerocallis in the lily family, having often grasslike leaves and yellow, orange, or purplish lilylike flowers. Also called hemerocallis.

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day lily

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