Persicaria pubescens (Blume) H. Hara, J. Jap. Bot. 17:335. 1941(syn: (=) Polygonum flaccidum auct.; (≡) Polygonum pubescens Blume (basionym); (=) Polygonum roettleri Roth) as per GRIN;
Polygonum pubescens Blume, Bijdr. Fl. Ned. Ind. 2: 532 532 1825. (syn: Persicaria flaccida (Meisn.) Nakai ex Sasaki; Persicaria flaccida (Meisn.) H. Gross; Persicaria hydropiper subsp. flaccida (Meisn.) Munshi & Javeid; Persicaria hydropiper subsp. microcarpa (Danser) Soják; Persicaria pubescens (Blume) H. Hara; Persicaria pubescens var. acuminata (Franch. & Sav.) H. Hara; Polygonum donii Meisn.; Polygonum flaccidum Meisn.; Polygonum flaccidum var. hispidum (Buch.-Ham. ex D. Don) Hook. f.; Polygonum hispidum Buch.-Ham. ex D. Don; Polygonum hydropiper var. acuminatum Franch. & Sav.; Polygonum hydropiper var. flaccidum (Meisn.) Steward; Polygonum hydropiper var. hispidum (Buch.-Ham. ex D. Don) Steward; Polygonum hydropiper subsp. microcarpum Danser; Polygonum oryzetorum Blume) as per The Plant List;
Indian Subcontinent to Japan and W. Malesia: Assam, Bangladesh, Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, Hainan, India, Japan, Jawa, Korea, Laos, Malaya, Manchuria, Nepal, Pakistan, Sumatera, Taiwan, Thailand, Vietnam, West Himalaya as per POWO;
Common name: Drooping Knotweed • Marathi: Sisori • Nepali: पिरे Pire

Persicaria longiseta (Bruijin) Kitag. ?? : 5 posts by 2 authors. Attachments (8)
Location: Dolakha, Nepal 
Date : 4 September, 2017
Elevation : 6000 ft.

I think yes, close to images at Persicaria longiseta

MS,Aug.,2021/07 Persicaria sp. for id.:
Location : Farkawn, Mizoram

Date : 02-10-2018
Habit : An annual herb
Habitat :Wild

Persicaria pubescens ??

May I request you to pl. post an image of the lower portion of the plant.

Sorry ! Not available sir

What are the species listed in your area?

2 attachments

May I request you to pl. post high res. images to check the details.
By following the keys and checking species in efloraofindia, I think it may be Perscaria glabra from among the listed species.

2 high res. images.

Persicaria longiseta (Bruijin) Kitag. ??

Yes, Persicaria longiseta is more closer and likely, as per images and details herein.
It is also likely to be found in the area as per distribution in POWO.

I think Persicaria pubescens (Blume) H. Hara as per Persicaria longiseta vs Persicaria pubescens


Fwd: SK421 13MAR-2017:ID : 13 posts by 4 authors. Attachments (13)

LocationPashupati, Kathmandu, Nepal
Date: 16 October 2016
Altitude: 4400 ft.
Which Persicaria  ??

I assume its Polygonum. … can help.

I think Persicaria longiseta (Bruijin) Kitag.
Family: Polygonaceae

Thank you …
A little confusion about the flowering period and the elevation
according to the eflora linked below.

It grows at various elevations. Pl, check its distribution in Flora of China. Sea level to 3100 m. Phenology also varies as per the location.

I think Persicaria pubescens (Blume) H. Hara as per Persicaria longiseta vs Persicaria pubescens

Flora of Manipur: Polygonum posumbi : Attachments (2).  15 posts by 6 authors.
Polygonum posumbi from Manipur.

… kindly check , this plant new to me hence when I went for a google search it did not gave me any result

There is a typo error. Pl check for Persicaria posumbu.

Now correctly placed as Persicaria posumbo (Buch.-Ham.ex D. Don) H. Gross (syn: Polygonum posumbo Buch.-Ham. ex D. Don; P. cespitosum Blume; Persicaria cespitosum (Blume) Hara).

Persicaria posumbu flowers are supposed to be short-stalked, but the flowers in your picture are on long slender stalks.

I suppose this plant to be Persicaria pubescens (Blume) H. Hara. A close scrutiny of the perianth will confirm the identity which should be glandular punctate.

Forgot to attach one link for comparison.

Seeing the images on this page
Persicaria pubescens seems to be the right ID!

Thanks …, finally u got the right id.
Thanks … for raising doubt that paved way for correct id.

Yes …, Real credit should go to … for the correct ID. Firstly, I also thought to go with Persicaria posumbu but after his query, I explored a little more and got the correct ID.


Polygonaceae fortnight Polygonum pubescens Blume SN May05 : 1 post by 1 author. Attachments (2).
Polygonum pubescens Blume (= P. hydopepper var. flaccidum (Meisn.) Steward, P. flaccidum Meisn),
slender erect herb in the hill stations. Gudalur near Ooty, Tamilnadu

Persicaria pubescens syn Polygonum pubescens : 2 posts by 2 authors. Attachments (4)
Sharing some pictures of P. pubescens shot at Kakani Nepal on 28 July 2016 at 2230 m.

ID validation please !

I think appear similar to other images at Persicaria pubescens

Persicaria pubescens (Bl.) Hara (accepted name)
Nepali Names : लाटो पिरे Laato Pire / सेतो पिरे Seto Pire

Persicaria hydropiper (L.) Delarbre from Meghalaya KD 01 Nov :  4 posts by 3 authors. Attachments (5)
Attached images may be Persicaria hydropiper (L.) Delarbre. Please validate.
Date :27.10.2014
Location: Meghalaya
Family : Polygonaceae
Genus & species : Persicaria hydropiper (L.) Delarbre 
Habitat: Grows wild on open space
Habit :Herb

Punctation on perianth is an important character not visible in your photographs. Please check your specimens with P. longiseta also.

Persicaria longiseta (Bruijn) Kitag.  ??

POLYGONACEAE FORTNIGHT 1-14 May 2014: P.hydropiper (L.) Delarbre from Uttarakhand_DSR_7 : 4 posts by 3 authors. Attachments (2).
Persicaria hydropiper (L.) Delarbre is a common herb in semi-aquatic habitats of mid hills in Uttarakhand.
Shot near Bhowali (Naini Tal), Uttarakhand.

I am little skeptical about the identity. Drooping inflorescence and pink color of perianth (above) are pointing towards P. pubescens. 

Close up of ochrea and nuts character can tell if it is really P. hydropiper.
some links for comparison:

Thank you … for pointing out. I will have to check it with specimens/ plants.
Till checked its ID may be considered doubtful.

Persicaria longiseta (Bruijn) Kitag. ??

It appears more closer to images at Persicaria longiseta (Bruijn) Kitag., as suggested by …

I think Persicaria pubescens (Blume) H. Hara only as per Persicaria longiseta vs Persicaria pubescens


The pics are insufficient for me, but this may not be the case for the experts..
Please suggest id.. Persicaria maculosa?? 

P. maculosa should have denser inflorescence. Other characters are not clearly visible… but tentatively it should be either P. pubescens or other closely allied species.

It appears more closer to images at Persicaria longiseta (Bruijn) Kitag.

I think Persicaria pubescens (Blume) H. Hara only as per Persicaria longiseta vs Persicaria pubescens


Persicaria hydropiper (L.) Delarbre (?) from Kamrup district, Assam:

Attaching images of what looks like Persicaria hydropiper (L.) Delarbre. Please confirm the ID.
Date :21.12.2012
Location: Kamrup district, Assam
Family : Polygonaceae
Genus & species : Persicaria hydropiper (L.) Delarbre (?)
Habitat: Grows wild on bank of the stream
Habit : Herb
Flower : Small, pink in colour

Not P. hydropiper. Please check for Persicaria posumbu Buch.-Ham. ex D.Don.

Found the following websites on P. posumbu
According to Bengal Plants P. hydropiper is a stoutish annual, copying the links of Bengal Plants pages –

Persicaria longiseta (Bruijn) Kitag. ??.

Looks similar to images at Persicaria pubescens (Blume) H. Hara

On further consideration, it appears more closer to images at Persicaria longiseta (Bruijn) Kitag., as suggested by  …

I think Persicaria pubescens (Blume) H. Hara only as per Persicaria longiseta vs Persicaria pubescens

Polygonacae Fortnight: Polygonum posumbu Buch.-Ham. ex D. Don (?) – from Assam KD MAY07 : 4 posts by 3 authors. Attachments (4).
Attached images may be Polygonum posumbu Buch.-Ham. ex D. Don. collected from Assam. Please ID the plant sp.  

I would appreciate if … uploads ochrea photographs too. The plant looks close to P. posumbu and P. longiseta but I am not sure. Even the nut characters are important.

Persicaria longiseta (Bruijn) Kitag. ??.

I think Persicaria pubescens (Blume) H. Hara only as per Persicaria longiseta vs Persicaria pubescens


Persicaria longiseta vs Persicaria pubescens:
I found confusion between the two on our site.
So decided to go through the descriptions from Flora of Pakistan, to find out the difference between the two:
Persicaria longiseta (De Bruyn) Kitagawa:
Ascending-erect, 15-60 cm high, glabrous, branched from base or above, annual herb. Stem brownish or reddish brown, glabrous, canaliculate. Leaves 2.5-12 x 0.75-3.5 cm, lanceolate-elliptic, acuminate, hairy, entire, with a rounded or cordate base, petiole 2-7 mm long. Ochrea 8-20 mm long, ovate, tubular, setose or ciliate, cilia almost equalling the ochreae or longer. Inflorescence very laxly flowered, interrupted 0.8-4.0 cm long, terminal-axillary raceme. Flowers up to 2.0 mm across, pedicel 1.0 mm long. Ochreolae 1.0-3.0 mm long, setose or ciliate, cilia 1.0-4.0 mm long. Tepals 5, biseriate, unequal, red, pink or whitish, ovate-obovate, obtuse. Stamens 5-8, filaments long. Ovary trigonous, rounded, with 3 styles, styles free above, fused below. Nuts trigonous, shining, black.
Fl. Per.: May-August.
GBIF specimens– onetwothree
Persicaria pubescens (Blume) Hara:
Very similar to Persicaria hydropiper (L.) Spach but usually much taller and with longer and larger leaves, up to 15 cm long, ochreae strigose, 10-15 mm long with much longer 8-10 mm long cilia. Spikes up to 15 cm long, filiform, which are rather drooping, extremely slender and much interrupted. Ochreolae glabrous-glandular with ciliate mouth. Perianth ± gland-dotted. Stamens always 8. Nuts trigonous.
Fl. Per.: June-August.
GBIF specimens– onetwothree
I think we can differentiate clearly based on the size and slender and drooping nature of the inflorescence.



Persicaria pubescens (Blume) Hara: 11 very high res. images.

Location: Jalthal, Jhapa, East Nepal
Date: 03 January 2023
Elevation: 110 m.

Habitat: Wild

Yes, appears close to images at


GRIN (Persicaria pubescens (Blume) H. Hara) Flora of Pakistan (Persicaria pubescens (Blume) Hara) Annotated checklist of Flowering plants of Nepal (Persicaria pubescens (Blume) H. Hara)  The Plant List  Tropicos  IUCN Red List (LC)  Flora of China Flowers of India (Polygonum pubescens)   India Biodiversity Portal (Persicaria pubescens)
PFAF   Persicaria pubescens (Blume) H. Hara  Weblio