Tên Khoa học: Hemerocallidaceae
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Tên tiếng Việt: Hoa hiên
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Hemerocallidaceae is the botanical name of a family of flowering plants. The family name is derived from the name of the included genus Hemerocallis. The placement of the included genera, and the circumscription of the family, have varied. The Cronquist system does not recognize the family and includes Hemerocallis  in Liliaceae. The APG II system includes the family in Xanthorrhoeaceae, in the order Asparagales  in the monocots clade, but allows for its optional segregation as a monophyletic family. Among the best-known members are two popular genera of garden plants, the daylilies (Hemerocallis) and New Zealand flax (Phormium).