Bistorta macrophylla (syn. Polygonum macrophyllum, syn. Persicaria macrophylla) is a flowering plant species in the buckwheat family Polygonaceae. It is native to mountain regions of West and South China (Gansu, Guizhou, Henan, Hubei, Qinghai, Shaanxi, Sichuan, Tibet, Yunnan), Bhutan, Nepal, northern India (Himachal Pradesh, Uttarakhand), and Pakistan.
In Nepal, its rhizomes are dried to be used as food.
In India (Uttarakhand), its leaves are used in traditional medicine to treat wounds. The paste made from the roots is given to infants for stomach problems.
Vernacular names: English: red knotweed or large leaved knotweed
Nepali: Dalle ghans, Dalle jhar
India: Kukhri, Chhota ninayin, Kande-re-ninai
Compounds (-)-Epicatechin-5-O-beta-D-glucopyranoside, (+)-catechin-7-O-beta-D-glucopyranoside, 1-(3-O-beta-D-glucopyranosyl 4,5-dihydroxy-phenyl)-ethanone, (-)-epicatechin, chlorogenic acid and gallic acid can be found in the species.