Persicaria viscosa (Buch.-Ham. ex D. Don) Nakai, Rigakkai 24: 300 (1926) as per Annotated checklist of Flowering plants of Nepal;
Himalaya to Russian Far East and Temp. E. Asia: Assam, Bangladesh, China North-Central, China South-Central, China Southeast, Khabarovsk, Korea, Laos, Manchuria, Nepal, Primorye, Taiwan, Thailand, Vietnam as per POWO;



Persicaria viscosa (Buch.-Ham. ex D. Don) Nakai : 3 posts by 3 authors. Attachments (5)
Sharing some pictures of Persicaria viscosa (Buch.-Ham. ex D. Don) Nakai shot at Jeewanpur Dhading Nepal on 2 May 2015 at 4000 ft.
From now on wards I am trying to include names in Nepali also. If not acceptable please do let me know.
Raato Pire रातो पिरे / Bhaale Pire भाले पिरे

Thanks, … It is always good to have any type of information.

Thanks for sharing nice pi​ctures and local names of P. viscosa.



Persicaria sp.(?) from Assam,10 Feb, 2014 : 4 posts by 3 authors. Attachments(10).
Attached images may be Persicaria (Polygonum) sp. Please ID the plant.
Date :12.02.2014
Location: Assam
Family : Polygonaceae
Genus & species : Persicaria (Polygonum) sp.
Habitat: Grows wild on ditches
Habit : Herb

Looks very close to Persicaria maculosa Gray (Polygonaceae) but the pubescence and leaf characters are intriguing! Needs more study.

efi page on Persicaria maculosa

I guess matching !

Can it be Persicaria viscosa as per images and details herein ?

I guess you are right … ! Persicaria viscosa 

Polygonacae Fortnight: Persicaria sp.– from Assam KD MAY 09 : 9 posts by 4 authors. Attachments (10).
Attached images may be Persicaria  sp. collected from Assam. Please ID the plant.
Date :12.02.2014
Location: Assam
Family : Polygonaceae
Habitat: Grows wild on ditches
Habit : Herb

This is close to or likely to be Polygonum viscosum Ham. –

But, majority of pics available in the net have a bit different leaves –

Thanks for the upload … and thanks for putting your efforts …!

The 5-parted perianth and hairy characters of the stem were also insisting me to go with Persicaria viscosa…. but the leaf shape and red blotch were confusing me. I wonder if the red blotch has earlier been reported in P. viscosa.
Generally we can see red blotches in P. maculosa and P. lapathifolia..but this plant is definitely different from both in having 5 parted perianth and hairy stem. Danser (1921) while working on P. lapathifolia, recorded leaf blotches a constant character. Hence still wondering where to put this plant.
Waiting for some more inputs.

Thanks … I was wondering how you missed this post. However, I stressed on hairy peduncle and bracts as well as ochrea. Didn’t find any red blotch, found a few darker patches. Leaves seemed to me okay, except wavy/undulate margin.

Thanks again for your comments …,

I was talking about those darker patches only… as seen in Fig. 5. I’ve never seen them in P. viscosa. Further please check the leaf margin and acumen in the links you have given. For me they are very different.
Probably I have to explore more in the field, herbaria and literature.
Till then we can take it as P. viscosa only.

I have no explanation for darker patches/blotches.
It seems to me that in the pictures in this thread there are two plants – one with bigger broader leaf, with serrate or crenate margin and the other plant is the Persicaria in question.
In this first pic if you see at the bottom middle you will see the perfect leaf of P. viscosa (leaf blade ovate-lanceolate or elliptical-lanceolate FoC, lanceolate acute or acuminate FBI).

Thanks … for writing back! Somehow I am still not convinced.
Please check this link (Research gate) which says the number of secondary nerves in leaf ranges from 19-23 (-25), margin is again entire. 
I agree that in the first and second pics a mixture of two plants can be seen. But still the leaf characters of the plant in question are intriguing.
Waiting to hear from other experts too.

Yes, …, agree, nerves are much less in this specimen. It should be some other species.


Identification help 1: 3 very high res. images.
i collected this beautiful polygonum from a field. Can you help me in identifying the plant. The details are as follows

Habitat- terrestrial, in grass field on the edges of a small water channel.
Habit- Erect herb, profusely hairy.
Inflorescence- Pink, deep pink.
Place: Karimganj, Assam
Date: 4.4.23
Elevation: 19m avg

Persicaria viscosa (Buch.-Ham. ex D.Don) H.Gross ex Nakai !

Yes, appears close as per images at


Annotated checklist of Flowering plants of Nepal  Ho-Yih Liu’s Flora  Filed as Persicaria viscosa (Buch.-Ham. ex D.Don) H.Gross ex T.Mori The Plant List Ver.1.1  (Polygonum viscosum Buch.-Ham. ex D. Don syn: Persicaria kuekenthalii H. Lév.; Persicaria viscosa (Buch.-Ham. ex D. Don) H. Gross ex Nakai; Polygonum kuekenthalii H. Lév.; Polygonum viscosum var. minus Hook. f.Tropicos

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