Bistorta macrophylla

{{Short description|Species of plant}}

{{Speciesbox

| image = Gartenflora (15872626959).jpg

| image_caption =

| genus = Bistorta

| species = macrophylla

| authority = (D.Don) Sojak, 1974

| synonyms =

• Persicaria macrophylla (D.Don) Cubey
• Polygonum macrophyllum D. Don
• Bistorta sphaerostachya (Meisn.) Greene
• Polygonum sphaerostachyum Meisn.

}}

Bistorta macrophylla (syn. Polygonum macrophyllum, syn. Persicaria macrophylla) is a flowering plant species in the buckwheat family Polygonaceae.{{cite web| title=The Plant List: Bistorta macrophylla (D.Don) Soják |date=2013 |url=http://www.theplantlist.org/tpl1.1/record/kew-2676809 |publisher=Royal Botanic Gardens, Kew and Missouri Botanic Garden }} 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.{{cite journal |title=Ethnobotanical studies in Central Nepal: The preservation of plant-foods |author=N.K. Bhattarai |journal=Contribution to Nepalese Studies |year=1991 |volume=18 |issue=2 |pages=211–221 |url=http://www.thlib.org/static/reprints/contributions/CNAS_18_02_07.pdf }}

In India (Uttarakhand), its leaves are used in traditional medicine to treat wounds.{{cite journal |last1=Phondani |first1=Prakash Chandra |title=Worth of Traditional Herbal System of Medicine for Curing Ailments Prevalent Across the Mountain Region of Uttarakhand, India |journal=Journal of Applied Pharmaceutical Science |date=2011 |volume=1 |issue=9 |pages=81–86 |url=http://japsonline.com/abstract.php?article_id=287}} The paste made from the roots is given to infants for stomach problems.{{cite book|author1=K. G. Mukerji|author2=C. Manoharachary|title=Current Concepts in Botany|url=https://books.google.com/books?id=s87ASB1KpIMC&pg=PA182|year=2006|publisher=I. K. International Pvt Ltd|isbn=978-81-88237-64-7|page=182}}

Vernacular names:

• English: red knotweed or large leaved knotweed
• {{zh|s=圆穗拳参|p=yuan sui quan shen}}
• 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.{{cite journal |pmid=15524292|year=2004|last1=Wang|first1=S|last2=Wang|first2=D|last3=Feng|first3=S|title=. [Studies on chemical constituents from Polygonum macrophyllum] |volume=27|issue=6|pages=411–3 |journal=Zhong Yao Cai |language=Chinese}}