Koenigia polystachya (Wall. ex Meisn.) T. M. Schust. & Reveal, Taxon 64: 1202 (2015) (syn: Aconogonon polystachyum (Wall. ex Meisn.) K. Haraldson; Aconogonon polystachyum (Wall. ex Meisn.) Kral; Aconogonon polystachyum var. pubescens (Meisn.) P. D. Sell; Persicaria polystachya (Meisn.) H. Gross; Persicaria wallichii W. Greuter & Burdet; Persicaria wallichii var. tomentosa S. P. Hong; Peutalis polystachya Raf.; Pleuropteropyrum hagei (Royle ex Bab.) A. H. Munshi & G. N. Javeid; Pleuropteropyrum polystachyum (Wallich ex Meisn.) A. H. Munshi & G. N. Javeid; Polygonum hagei Royle ex Bab.; Polygonum molle Wight; Polygonum polystachyum Meisn.; Polygonum polystachyum var. longifolia J. D. Hooker; Polygonum polystachyum var. pubescens Meisn.; Reynoutria polystachya (Wall.) Moldenke; Rubrivena polystachya (Wall.) M. Král) as per Catalogue of life;
Rubrivena polystachya (Wall. ex Meisn.) M. Král, Preslia 57:66. 1985 (Syn: (=) Persicaria polystachya (Wall. ex Meisn.) H. Gross; (≡) Persicaria wallichii Greuter & Burdet; (≡) Polygonum polystachyum Wall. ex Meisn. (basionym)) as per GRIN;
Persicaria wallichii Greuter & Burdet , Willdenowia 19: 41 1989. (syn: Aconogonon polystachyum (Wall. ex Meisn.) M.Král; Aconogonon polystachyum (Wall. ex Meisn.) Haraldson; Peutalis polystachya (Wall. ex Meisn.) Raf.; Polygonum polystachyum Wall. ex Meisn.; Reynoutria polystachya (Wall. ex Meisn.) Moldenke) as per The Plant List;
Afghanistan to S. Central China: Afghanistan, Assam, China South-Central, East Himalaya, Nepal, Pakistan, Tibet, West Himalaya; Introduced into: Austria, Belgium, British Columbia, California, Czechoslovakia, Denmark, France, Germany, Great Britain, Ireland, Korea, Massachusetts, Myanmar, Netherlands, Newfoundland, Norway, Oregon, Sweden, Switzerland as per POWO;
Common name: Himalayan knotweed, Cultivated knotweed
As per efi thread:

Koenigia polystachya (Wall ex Meissn.) T. M. Schust. & Reveal: leaf base is subcordate to truncate, perianth not enlarged or fleshy in fruit  (syn: Rubrivena polystachya (Wall. ex Meissn.))
Koenigia mollis (D Don) T. M. Schust. & Reveal: leaf base cuneate, perianth enlarged and  fleshy in fruit (Syn: Polygonum molle D Don; Persicaria mollis (D Don) H Gross)



VOF Week: Polygonum polystachyum for validation from Valley:
This was abundant in the valley, I hope this is Polygonum polystachyum Wall. Kindly validate/correct…

Yes …


Vof Week: Persicaria wallichii from Valley:

Persicaria wallichii from Valley
pls validate

Yes … Very good photographs of this beautiful species.


Polygonum sp. from Paddar valley J&K. 01:
Request for identification

Can this plant be Polygonum tortuosum
Family: Polygonaceae
Location: Paddar valley J&K.
Date: 17th September 2011
Altitude: 2400 meters

Sorry can this plant be Polygonum polystachyum

I hope yes Polygonum polystachyum now correctly known as Persicaria wallichii Greuter & Burdet

Many plants of my area like
Podophyllum hexandrum
Geum elatum
Pteracanthus urticifolius
Tanacetum tibeticum
Bistorta amplexicaulis
Gagea elegans etc.
have different accepted names in The Plant List and in some Indian Plant databases like FRLHT Encyclopedia, Indian Medicinal Plant database, Digital Library of Triditional Knowledge and also in various Indian Plant Literature sources.
Kindly guide me if I can use the accepted names and families of The Plant List in my thesis writing or should I follow the nomenclature as per Indian database.


Bangalore-Ooty November 2013 :: Requesting ID of this plant at Ooty :: 16122013 :: ARK-18: Attachments (3). 7 posts by 5 authors.
Requesting to please ID this plant captured growing wild in Ooty in November 2013.

Polygonum sp.

I cannot decide if this is a Polygonum or Fagopyrum 

Looks like P. polystachyum
I hope it is reported from the area

Thank you … for feedback.
The accepted name of Polygonum polystachyum is Persicaria wallichii

Yes! To me also it looks like Persicaria wallichii.

Thank you … for confirmation…

Polygonaceae Fortnight Persicaria polystachya from Gulaba in Kulu Distt: 5 posts by 5 authors. Attachments (1).
Snapped from, way to Rohtang Pass near Gulaba in Kulu Distt. at 2900 m/

The accepted name for this plant is Persicaria wallichii Greuter & Burdet as per The Plant List, and Rubrivena polystachya (Wall. ex Meissn.) M. Kral as per the GRIN Taxonomy. :-I

This shrub was found to be dominating the landscape of Hampta Village at approx. 8500 ft to 9000 ft altitude. Beautiful creamy white small size flowers were looking too cool.
Family: Polygonaceae
Bot. name: Aconogonon sp. ??

Likely to be Persicaria wallichii..

I think yes

This much spreading species has covered larger parts of landscape in VOF..
Also recorded from Gori Valley area..
Persicaria wallichii

Beautiful and detailed capture!


POLYGONACEAE FORTNIGHT 1-14 May 2014: Polygonum polystachyum from Himachal GSG-02 : 2 posts by 2 authors. Attachments (1).
Find below an image of Polygonum polystachyum (=Rubrivena polystachya) from Kinnaur, Himachal Pradesh.

Polygonum polystachyum var. polystachyum is a noxious weed in Valley of Flowers and in many other alpine zones of Uttarakhand.
Shot near Kedarnath, Uttarakhand.

Yes, now known as Persicaria wallichii

Find below image of Polygonum polystachyum (=Rubrinervis polystachya) from GHNP, Himachal Pradesh.

yes now Persicaria wallichii

Thanks … for appreciation and for suggesting updated nomenclature. BSI, in its very latest publication by Pusalkar PK & D K Singh titled ‘Flora of Gangotri National Park’, 2012, refers to this species as Rubrivena polystachya (Wall. ex Meisn.) M. Kral.
Yes, it needs confirmation.

Attached are pictures of Persicaria wallichii from Ooty, Tamil Nadu captured in November 2013.
Kindly validate.

Another good find, Thanks … for sharing..

Polygonaceae fortnight Ploygonum sp ID ? SN May 10 : 7 posts by 4 authors. Attachments (2).
Polygonum species from Ooty Botanical garden ID Please

Looks like Aconogonon molle.

To me this is more like Persicaria wallichii..

It is Polygonum wallichii only because the inflorescence is short, leaves with 16-20 pairs of nerves.

Perscaria wallichii Greuter & Burdet (= Polygonum polystachyum wall ex Meisn. )


Persicaria wallichii at Shilt – GHNP – PKA95 : 1 post by 1 author. Attachments (7).

Seen this big herb at Shilt at GHNP (Altitude approx. 3000m).
Bot. name: Persicaria wallichii
Family: Polygonaceae



HP, Oct 2014 :: Requesting ID validation – Persicaria wallichii :: ARKDEC-38 : 2 posts by 2 authors. Attachments (6).
Requesting to please validate ID of this Persicaria captured near Manali, HP in October 2014.
I hope this is Persicaria wallichii (based on FoI pics).


Flower identifaication : 4 posts by 3 authors. Attachments (3)
Recently i visited the place called chandrashila in uthrakand. I have seen these flowers near the tungnath temple. These flowers are so simple but looking great on the site. You may all know this. Please tell me the name of this flower.

Certainly beautifully photographed.
It would be nice if you post pictures after resizing to a reasonable of around 200 Kb size (with min. 800 by 600 pixels) in future.

Please reduce the size of images in future uploads…

These pics belong to Persicaria wallichii a cumbersome high altitude weed..

Persicaria wallichii ABSEP2016/05 : 2 posts by 2 authors. 6 images.
This beautiful aromatic plant brightened the hillsides above Triund. It was abundant at 3400m and seemed to climb even farther and I guess its tenacity in multiplying has earned it the name ‘weed’ which doesn’t reflect its beauty (similarly the other Persicaria species here which are beautiful, pink P. amplexicaulis is seen in the last but one photo sharing the grounds). Please correct me if I am making a mistake in identifying it.
Persicaria wallichiiHimalayan Knotweed
Above Triund, HP, 3000m and above, 03-04 September 2016

Saw these around Ghangaria and en route Hemkund, Uttarakhand in Aug 2018.
Was seen in very large numbers covering large areas.
In FOI, it is named as Koenigia polystachya.
Kindly validate.

yes, himalayan knotweed, a pesky weed in europe and America. not as bad as the japanese knotweed, but a lesson has to be learned
takes over natural native habitats.
this link shows it has appeared in western ghats also, when etc i do not know
https://www.cabi.org/isc/datasheet/120210  scroll down to half way for the world map. lesson never carry any seeds out or tranplant any alpine plant. wonder if Forrest dept in maharashtra and india and BSI have noted this


26-09-2010: Hampta Village (8500 ft altitude approx.) Manali region; South Sikkim- 17 Oct.’2010; on 13/8/10 during the trek from Ghangaria (around 11,000 ft.) to Hemkunt Sahib (around 14000 ft.);

Flora of Uttarakhand- Herb57 for Id- JM – efloraofindia | Google Groups
Sikkim Flower 3 – efloraofindia | Google Groups
Aconogonum Sp? 171010PKA1 – efloraofindia | Google Groups