Persicaria glabra (Willd.) M.Gómez , Anales Inst. Segunda Enseñ. 2: 278 1896. (syn. Persicaria densiflora (Meisn.) Moldenke; Persicaria portoricensis (Bertero ex Small) Small; Polygonum densiflorum Meisn.; Polygonum glabrum Willd.; Polygonum glabrum Cham. & Schltdl.; Polygonum mexicanum Small; Polygonum portoricense Bertero ex Small; Polygonum portoricense Bertero ex Endl.; Polygonum segetum var. verrucosum Stanford);
New World, Central African Republic to Arabian Peninsula, Tropical & Subtropical Asia: Alabama, Argentina Northeast, Argentina Northwest, Arkansas, Assam, Bangladesh, Bolivia, Brazil South, Brazil Southeast, Brazil West-Central, Cayman Is., Central African Repu, China South-Central, China Southeast, Colombia, Cuba, Delaware, Dominican Republic, East Himalaya, Ethiopia, Florida, Georgia, Guatemala, Hainan, Haiti, Honduras, Illinois, India, Jamaica, Jawa, Kentucky, Louisiana, Maryland, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Myanmar, Nepal, New Jersey, Nicaragua, North Carolina, Oman, Pakistan, Paraguay, Peru, Philippines, Puerto Rico, Saudi Arabia, Socotra, South Carolina, Sri Lanka, Sudan, Taiwan, Tennessee, Texas, Thailand, Uruguay, Venezuela, Vietnam, Virginia, West Himalaya, Yemen as per POWO;
common marsh buckwheat, denseflower knotweed • Assamese: lalborna, patharua, ranga bihalogoni • Kannada: ಣೀರು ಕಣಿಗಳು niru kanigalu • Malayalam: sckoranna mudela mucca • Marathi: शेरल sheral • Mizo: chakaifu • Nepali: seto pire  • Tamil: aatlaria;
Presence of ochrea is not characteristic to the whole Polygonaceae family rather specific to the subfamily Polygonoideae only. It is absent or rudimentary in members of the subfamily Eriogonoideae.

Nut biconvex- P. glabrum (Persicaria glabra).
Nut trigonous P. barbatum
Bracts not ciliate on the margins . P. glabrum. (Persicaria glabra).
Bracts ciliate on the margins – P. barbatulum
Ocreae (A sheath formed at the node of a stem by the fusion of two stipules) 2-4cm long, tubular, glabrous, truncate at mouth – P. glabrum (Persicaria glabra).
Ocreae 1.5-2.5 cm, tubular, strigose (Having stiff, straight, closely appressed hair), with very long ciliae at the mouth- P. barbatum


Flora of Madhya Pradesh: Persicaria glabra (Willd.) M.Gómez from Panna National Park MP:
Persicaria glabra (Willd.) M.Gómez from Panna National Park MP





Persicaria glabra (Willd.) M.Gómez (Hooghly):  (10 images)

This seems to be the :-
  • Persicaria glabra (Willd.) M.Gómez of The Plant List
  • Persicaria glabra (Willd.) M.Gómez of GRIN
  • Persicaria glabra (Willd.) M.Gómez of FoP
  • Polygonum glabrum Willdenow of FoC & Flora Indica
It is interesting to note the Style of this plant :-
  • Styles 2 in FoC
  • Styles 2 in FoNA
  • Styles 2, rarely 3 in FoP
  • Style three-cleft in Flora Indica
These photos were shot on the bank of Hooghly river (The Ganges) in Chandannagore, Hooghly, on 22/02/2013.
Please, also note that neither of the two pictures in my earlier post, is Persicaria glabra (Willd.) M.Gómez, because leaves of Persicaria (Polygonum) are alternate

Yes! Persicaria glabra from me too. Thanks for sharing …

Very good photographs.
You have clearly shown a specific character of the family (Images DSCN 143 to 146).
Ochrea, commonly spelled ocrea, is a structure formed of stipules fused into a sheath surrounding the stem. It is a diagnostic character in the Polygonaceae.

Thanks for your comments …! Would like to share that presence of ochrea is not characteristic to the whole Polygonaceae family rather specific to the subfamily Polygonoideae only. It is absent or rudimentary in members of the subfamily Eriogonoideae.

Great … I noticed a thing; shared on the group; and ultimately got more information. I am happy to be a member of this interactive forum with so many talented members who are ever ready to share so much.
Even the Ice cream creeper Antigonon leptopus is said to be devoid of Ochrea I suppose.

Yes Sir…you are very correct. More we share..more we learn!
eFlora is a great learning experience for me too…and many thanks for taking this positively.
Never noticed that Antigonon leptopus are devoid of ochrea. Fl. N. America mentions size of ochrea in the same plant as 0.2-2 mm.

Thanks … I know You are the expert in Polygonaceae.
My sentence about Antipogon was based on some earlier discussion where … has replied to one of my query related to the family. (Somehow I can’t find that thread now…may be it was with my earlier mail ID)
I checked your link too. It stimulated me to dig in further but couldn’t find much.
I think you only will come out with some conclusive statement related to Antigonon leptopus.

You are also correct! Antigonon leptopus belongs to the subfamily Eriogonoideae.
As stated earlier, ochrea in subfamily Eriogonoideae is either absent or rudimentary. Same is true for A. leptopus where ochrea is a very small (0.2-2mm) membranous structure that may not actually be well defined as ‘ochrea’.
Requesting you to have a close look on this herbarium sheet. You will find the answer.


Flora of Haryana: Persicaria glabra from Pujam Karnal:
Persicaria glabra from Pujam Karnal
pls validate

Yes…looks like P. glabra to me too.


Polygonaceae Fortnight : Persicaria glabra : 2 posts by 2 authors. Attachments (2).
sharing pic of Persicaria glabra
From Sindhudurg MH

Many thanks for sharing …! Very beautiful photos!!


Request ID of wild flower at Nagarhole – 030711SS01:
Request ID of the following wild flower shot at Nagarhole National Park near Mysore as per the following details:
Date/Time- June 2008
Location- Place, Altitude, GPS-  Nagarhole National Park, near Mysore
Habitat- Garden/ Urban/ Wild/ Type-  Wild growing
Plant Habit- Tree/ Shrub/ Climber/ Herb- Herb
Height/Length-  1 ft-2 ft
Leaves Type/ Shape/ Size- Spindle
Inflorescence Type/ Size-  NA
Flowers Size/ Colour/ Calyx/ Bracts-  Long and pointy, purple coloured

Common Marsh Buckwheat – looks to be polygonam glabrum

Yes looks close to P. glabrum but not P. hydropiper.



efloraindia: 220911 BRS43:
Pl. find the attached file contain the photo for id.
(Habitat photo also attached)

Date/Time-Location-Sep. 2009, Kodungarai River
Place, Altitude, GPS- Anaikatti, (630 MSL) Coimbatore Dist.,
Habitat-  Wild (along the river side)
Type-Plant Habit- Shrub
Flowers Size/ Colour- Pink

Ooh Polygonum glabrum is now synonymous with Persicaria glabra of Polygonaceae family.

identification no 260911sn1:  date/time:aug 11
plant habit:herb
height:about 3 ft.
other info:this is only one I have come across so far.


ID Please.:
These beautiful flowers ane imaged today morning at Pune.

Persicaria glabra, Polygonaceae

Persicaria glabra (Willd.) M.Gómez (=Polygonum glabrum Willd.),
common undershrub near water bodies

Polygonaceae Fortnight:: Persicaria glabra :: Pune :: SMP04 : 2 posts by 2 authors.
Persicaria glabra. Near River Mutha banks. Pune

Very clear pictures! Thanks for the upload sir!

Attached are pictures of Persicaria glabra from Corbett, Uttarakhand captured in November 2012.
Kindly validate.

Yes! P. glabra.


Polygonaceae Fortnight- Polygonum for id from Chakrata:: NS May 27 :  5 posts by 3 authors. Attachments (2).
Please help to id this species of Polygonum
I have only these pics..

Eciliate ochrea and glabrous character are pointing towards Persicaria glabra.

Thanks …, I was not very sure, though tentatively I was having same opinion..

Probably it is not from the altitudes of Chakrata which is temperate zone where P.glabra rarely reaches.

Thanks for pointing out … this may be from a lower area on the way, I will try to make out exact location..

Polygonaceae Fortnight : 1 – 14 May 2014 : Persicaria glabra : Nasik : 140514 : AK-10 : 3 posts by 3 authors. Attachments (3).
Growing wild in Nasik.

Yes! A common species…beautifully captured!

This is again very commonly found species of Polygonum in our area.. (Panipat)
Please validate or correct the id..
Persicaria glabra

Beautiful photos! Thanks for sharing!


Persicaria glabra : For Validation : Bangalore : 10DEC14 : AK-34 : 6 posts by 4 authors. Attachments (2)
Seen on 12th Nov,14, growing wild near a lake.
Kindly validate.

Yes! Persicaria glabra from me too!

The Plant which has been uploaded by you is Persicaria lapathifolia

Thanks for your opinion …!

My identification was based on the glabrous character of the plant and the absence of blotches on the leaves which are generally present in P. lapathifolia.
Would like to hear more from you.

ID request 070416SG : 4 posts by 3 authors. Attachments (4)
Requesting ID of this bush, about 2-3’ high. Photo taken on 4Apr16 at Solapur, Maharashtra.

Perhaps Persicaria lapathifolia

To me it look similar to the images at Persicaria lapathifolia, but I am not sure.

Persicaria glabra

I too think that this is Persicaria glabra


Flower for Id – ID19042016SH1 : 7 posts by 3 authors. Attachments (1)
Flower for Id pl.
Location – Vasai ( Dist.-Palghar,Maharashtra)
Date – 17.4.2016

knotweed. persicaria sp

Polygonum glabrum

Ah great. since persicaria and Polygunum are both KNOTWEEDs in colloquial herbal ids and food foraging, how does one differentiate them botanically. I will greatly appreciate help in this.
… or anybody else that knows this, please tell us.

Thanks …, it’s Persicaria glabra (Denseflower Knotweed)

Fwd: Polygonum for id? Assam. 12.11.17 : 8 posts by 2 authors. Attachments (1)- 4 MB.

Attachments (1)- 6 MB.

Attachments (1)- 4 MB.

Attachments (1)- 4 MB.

Attachments (1)- 3 MB.

Attachments (1)- 2 MB.

Looks like Persicaria glabra (Willd.) M. Gomez



Persicaria ID from Bangladesh SM 198 : 4 posts by 4 authors. 5 correct images as above.

Persicaria hydropiper ?

Pic5 looks like P. hydropiper, for others I am not sure, please check Persicaria glabra and wait for experts.

27032020EPT68 : 5 posts by 3 authors. Attachments (1) – 633 kb.

Presenting for ID
Location : Javadhu hills, Eastern Ghats
Elevation : 3600 feet
Taken on 12.02.2020

It is Persicaria glabra

Id of Polygonum : 14 posts by 4 authors. Attachments (1)
Request for I’d of Polygonum from Bilaspur. Photographed today. (25.9.20)

Persicaria decipiens (R.Br.) K.L.Wilson ?? 

your I’d is correct.

Persicaria glabra

Thanks … I will check. Could also be P. hydropiper.

This is Persicaria glabra (as identified by …) rather than Persicaria decipiens or Persicaria hydropiper, as per images and details herein.


Plant for ID: Bangalore: Lake near Nandi hills: 26th Mar 2021: 4 images.
Is this Persicaria amphibia? I’m getting different kinds of pictures from different websites. Please help!
Photographed beside a lake near Nandi hills, Bangalore. About 2 feet high, with thin waxy leaves.

Looks close to Persicaria glabra to me.

Perfect. Thank you very much,

Thanks, …, for id as Persicaria glabra

I also agree with P. grabra

I agree with P.glabra

Persicaria glabra: Persicaria glabra – Polygonaceae
Herb, Height –1.5 Meter, Pink Flower, Raceme -Terminate,
Leaves-Alternate, approx-20-25 cms
Habitat: Near Irrigation water canal
Chandagal, Mysore


Persicaria from Bilaspur: 2 high res. images.
Request for I’d of Persicaria from Bilaspur. Photographed in September, 2021.

Persicaria glabra (Willd.) M.Gómez ??

Yes, appears close to images at Persicaria glabra


Persicaria glabra from Mullayangiri Bababudangiri Road-GS13022022-5: 5 very high res. images.
Persicaria glabra from Mullayangiri Bababudangiri Road, Karnataka, 26-9-2015.