The Mile-a-minute weed (Persicaria perfoliata) belongs to Polygonaceae (the Buckwheat family). It is an annual plant that is widely distributed to Japan, as well as the Korean Peninsula, China, Taiwan, Philippine and the Malay Peninsula. This herb grows in moist soils on stream banks, lakesides and rice field linches and the vine may exceed 1-2 m in length. Stems have acute downward spines, and convolve another ees and herbs. Leaves are trianglar, alternate, and the stipules are round foliate. July to October, racemes with small pale greenish flowers are seen on the termial branchlets. Fruits are globular achenes coverd with carnous sepals and ripen bluish-azure.