Reynoutria multiflora

Pleuropterus multiflorus (syns. Fallopia multiflora, Polygonum multiflorum, and Reynoutria multiflora) is a species of flowering plant in the buckwheat family Polygonaceae native to central and southern China, Hainan, Taiwan, Vietnam, and Thailand. It is known by the English common names tuber fleeceflower and Chinese (climbing) knotweed. It is known as he shou wu (何首烏) in China and East Asia. Another name for the species is fo-ti, which is a misnomer. It can be difficult to prevent the spread of this vine and to remove it once established. The leaves are thin and fragile but the stems, although narrow in diameter, can be very strong....read more on Wikipedia.