Fallopia multiflora (Chinese Knotweed; Chinese: 何首乌; hé shǒu wū) is a species of Fallopia in the buckwheat family native to central and southern China.Fallopia multiflora is also known by its synonym, Polygonum multiflorum, and is very often referred to as such in PubMed.Fallopia multiflora is a herbaceous perennial vine growing to 2–4 m tall from a woody tuber. The leaves are 3–7 cm long and 2–5 cm broad, broad arrowhead-shaped, with an entire margin.