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Daylilies are perennial plants. The name Hemerocallis
comes from the Greek words ἡμέρα (hēmera) "day"
and καλός (kalos) "beautiful". This name alludes to the
attractive flowers of this genus which typically last no
more than 24 hours. The flowers of most species open
in early morning and wither during the following night,
possibly replaced by another one on the same scape
(flower stalk) the next day. Some species are night-
blooming. Daylilies are not commonly used as cut
flowers for formal flower arranging, yet they make
good cut flowers otherwise as new flowers continue to
open on cut stems over several days. There are over
60,000 registered cultivars.