Large-leaf dogwood (Swida macrophylla) belongs to the Cornaceae (the Dogwood family). It is a tall deciduous tree that is distributed to Honshu, mainly westward from Kinki district to Shikoku, Kyushu of Japan, as well as the Korean Peninsula, China and the Indo-China Peninsula. This tree grows in montane forests or suuny gentle slopes, and can reach 8-12 m in height. The corymbs are borne on the terminal branches, and the small yellowish-white flowers bloom from June to July, in retard a month of the Giant dogwood's flowering. It is defined by elongated ovate-oblong leaf-blades, short acute tips and distinct opposite phyllotaxis.