Persicaria chinensis (synonym Polygonum chinense),[1] commonly known as creeping smartweed[2] or Chinese knotweed, is a plant species from the family Polygonaceae.

It is widespread across China, Japan, the Indian Subcontinent, Indonesia, Malaysia, and Vietnam.

[3] 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.

Its cymes emerge at terminals, and are 5–7 cm long, with small white or pink flowers.

Its fruits are berries, globose in shape and enclosed in the enlarged and fleshy calyx at maturity.