Bistorta rubra K. Yonekura & H. Ohashi, J. Jap. Bot. 74: 338 (1999);
Nepal, West Himalaya as per POWO;
Common name: Crimson Knotweed


Polygonaceae Fortnight: Persicaria sp. for ID from Chopta Uttarakhandr-GSMAY47 : 4 posts by 3 authors. Attachments (2).
Persicaria sp. photographed from near Chopta in Uttarakhand.
Looks like P. capitata but leaves appear to be larger, please help in ID.

Probably B. affine.

Sir, Chopta is too low altitude (27-2800m) for B.affine which occur above 3500m in Uttarakhand. It may be Bistorta macrophylla.

Thanks … for possible ID.

It looks different from both Bistorta affinis (D. Don) Greene as well as Bistorta macrophylla (D.Don) Soják
Can it be Bistorta milletii as per Flowers of India and GBIF specimen- one, although I find distribution in Nepal and east of it only?

I shall check and let you know.


Regarding Polygonum milletii:
I have an issue with the distribution of Polygonum milletii from UttrakhandPlease have a look.

The species shown in FoI may not be correctly identified.
To me it appears as Polygonum macrophyllum (B. macrophylla).
Compare with B. macrophylla in eFlora of India.

CoL : Distributions China (?Qinghai, S-Shaanxi, Sichuan, Yunnan); Bhutan; N-India; Nepal

GBIF : map in attachment
Possible according to the above databases.
1 attachment

Bistorta milletii in FOI:
… image at Bistorta milletii in FOI, may be of Bistorta macrophylla, as per images and details herein.

Pl. remove this to avoid any confusion.

Also see discussions at Regarding Polygonum milletii

Yes, since leaves are not visible in Pravin’s image of Bistorta milletii on FOI, it should be removed to avoid confusion. However, according to new research (see attached paper of 1999), there is no Bistorta milletii in either Nepal or Uttarakhand. The plants earlier considered as Bistorta milletii in Nepal are Bistorta milletioides or Bistorta confusa.The plants in Uttarakhand, which resemble Bistorta milletii, should be Bistorta rubra Yonek. & H.Ohashi. So, I conclude that the plant on FOI, under discussion here, is Bisitorta ruba.
1 pdf attachment

Image 2 and 3 of  FoI somehow seems B. macrophylla for me, I’ve attached an image for your reference, please check.
1 image

From where (publication etc.) the reference image has been taken?

not from any publication. It was captured by me, referenced for leaves only.

I tend to agree with …, as per the publication attached by him.


POWO  Catalogue of Life  Flowers of India
A Revision of Plants Hitherto Referred to Bistorta milletii(Polygonaceae) in Nepal (pdf)- Koji Yonekura, Hiroyoshi Ohashi- December 1999 Journal of Japanese Botany 74(6):329-343