Polygonum chinense, commonly known as creeping smartweed or Chinese knotweed, is a plant species from the family Polygonaceae. It is widespread across China, Japan, the Indian Subcontinent, Indonesia, Malaysia, and Vietnam. It is a common plant in Malaysia and Vietnam, where it is used in herbal remedies, such as for the treatment of dysentery, enteritis, and sore throat. It is a weed in some coastal areas of New South Wales and Queensland in Australia.
P. chinense is a perennial climber that grows to 2–3 m high. Its stems are glabrous and red-brown, with longitudinal stripes. Its leaves have oval blades, are 4–8 cm long and 3–5 cm wide, with pointed apex and round or nearly cordate base. Its cymes emerge at terminals, and are 5–7 cm long, with small white or pink flowers.
- Tropicos, Polygonum chinense L.
- English Names for Korean Native Plants (PDF). Pocheon: Korea National Arboretum. 2015. p. 565. ISBN 978-89-97450-98-5. Archived from the original (PDF) on 25 May 2017. Retrieved 25 January 2016 – via Korea Forest Service.
- Flora of China, Polygonum chinense Linnaeus, 1753. 火炭母 huo tan mu
- Tanaka, Yoshitaka; Van Ke, Nguyen (2007). Edible Wild Plants of Vietnam: The Bountiful Garden. Thailand: Orchid Press. p. 121. ISBN 9745240893.
- Wilson, K.L. "New South Wales Flora Online: Persicaria chinensis". Royal Botanic Gardens & Domain Trust, Sydney, Australia.
- Integrated Taxonomic Information System ITIS standard report, Polygonum chinense
- line drawing, Flora of China Illustrations vol. 5, fig. 248, 1
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