"Goma-gi" (Viburnum sieboldii) belongs to Caprifoliaceae (the Honeysuckle family). It is a tall deciduous tree that is distributed westward from Kanto district to the Pacific Ocean Side of Honshu, Shikoku, Kyushu and the Okinawa Islands in Japan. This tree grows in mountains and can reach about 7 m in height. The leaves are obovate-elliptic with toothed edges at the upper parts, and arranged in opposite. The panicles are borne on terminal branches, and the small white flowers bloom from April to June. The fruits are drupes, and ripen in red to black. The Japanese name is derived from the sesame-like fragrant when the branches or leaves are injured.