Yamaji-no-hototogisu (Tricyrtis affinis) belongs to the Liliaceae (the Lily family). It is a perennial herb that is distributed southward from south-western Hokkaido to Honshu, Shikoku and Kyushu. This herb grows in mountain forests and can reach 30-60 cm in height. The obliquely downward, rough hairs bear on the stems. The leaves are elliptic to narrow-elliptic, opposite, and enfold stems. The 1-3 flowers bloom at the atop of stems and axils from August to October. The tepals spread out at the upper parts. The outer tepals are three, swollen, pouch-like shaped at the bases, and the innner tepals are three and as long as outer ones.