Nikkōkisuge

Hemerocallis esculenta
Hemerocallis esculenta in the Hida Mountains, Gifu Prefecture
Scientific classification
Kingdom:	Plantae
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Asphodelaceae
Subfamily:	Hemerocallidoideae
Genus:	Hemerocallis
Species:	H. esculenta
Binomial name
Hemerocallis esculenta Koidz.
Synonyms
Hemerocallis dumortieri var. esculenta (Koidz.) Kitam. Hemerocallis middendorffii var. esculenta (Koidz.) Ohwi Hemerocallis pedicellata Nakai

Hemerocallis esculenta, (nikkōkisuge or zenteika; in Japanese: 日光黄菅 or 禅庭花) is a perennial plant belonging to the family Asphodelaceae. It is native to Japan, Russia and China. Its yellow flower blooms in early summer, especially in the highlands of Japan in large groups.

Some of the places where the Nikkōkisuge grows:

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Wikipedia