Persicaria barbata (L.) H. Hara, Fl. E. Himalaya 70 70 1966. (syn: Persicaria omerostroma (Ohki) Sasaki; Polygonum barbatum L.; Polygonum kotoshoense Ohki; Polygonum omerostromum Ohki;                 (=) Polygonum rivulare K. D. Koenig ex Roxb.);
Arabian Peninsula, Tropical & Subtropical Asia: Assam, Bangladesh, Bismarck Archipelago, Borneo, Cambodia, China South-Central, China Southeast, East Himalaya, Hainan, India, Iran, Jawa, Laccadive Is., Laos, Lesser Sunda Is., Malaya, Maluku, Myanmar, Nansei-shoto, Nepal, New Guinea, Pakistan, Philippines, Saudi Arabia, Solomon Is., Sri Lanka, Sumatera, Taiwan, Thailand, Vietnam, West Himalaya, Yemen as per POWO;
Common name: Bearded Knotweed, water milkwort • Bengali: bekh-unjubaz • Kannada: konde malle, kondemalle • Malayalam: belutta-modela-mucca • Manipuri: যেলাঙ Yelang • Marathi: dhaktasheral • Mizo: anbawng • Nepali: बिश Bish • Tamil: niralari, neer alari • Telugu: kondamalle, neeruganneru ;


Persicaria barbata from Delhi:
Persicaria barbata (L.) Hara (syn: Polygonum barbatum L.) from Delhi, growing along banks of River Yamuna, Wazirabad.

The seeds are used in griping colic pain in Kalahandi area of Orissa state whereas, the aerial parts possess antinociceptive, anti- inflammatory and diuretic properties. Roots are used as an astringent and cooling remedy. Decoction of leaves and shoots is used as a stimulating wash for ulcers, acting as a good healer of the scarred tissue. A paste of the root is used externally in the treatment of scabies. (Source:  Kirtikar and Basu, 1935 and others).

.aquatic plant for ID070311AMS3:
This is obviously a Polygonaceae member but ironically you are missing
providing proper details for each of your upload. These details will be good for both you and us in maintaining our database.

Persicaria barbata (syn. Polygonum barbatum) of family: Polygonaceae






Persicaria sp.2 Hooghly 01-Jan-2013 sk2:  Found this Persicaria in a marsh.

Species : UNKNOWN
H & H : about 2 ft herb, erect
Date : 17/10/12
Place : Hooghly

This looks like Persicaria barbata (L.) Hara to me. (Polygonaceae)

Thank you very much … for the ID, it is Persicaria barbata (L.) Hara to me too as have been identified by you.

Hooghly : Persicaria2 21/5/13 sk2 : Attachments (10). 4 posts by 3 authors.

Date/Time- 18/5/13, 1.40 pm

Location- Place, Altitude, GPS- Hooghly, what is GPS?

Habitat- Garden/ Urban/ Wild/ Type- wild

Plant Habit- Tree/ Shrub/ Climber/ Herb- herb

Height/Length- about 3 ft

Leaves Type/ Shape/ Size- don’t know botanical terms

Inflorescence Type/ Size- 3-4 cm, can’t express type in botanical terms

Flowers Size/ Colour/ Calyx/ Bracts- white, size small, seems to have either no calyx or all calyx, what is bracts?

Fruits Type/ Shape/ Size Seeds- not seen

Other Information like Fragrance, Pollinator, Uses etc.- didn’t smell, god knows

I hope Persicaria barbata (L.) H. Hara
Family: Polygonaceae

This white flowered Persicaria was found planted near water body in Pune University campus.
I don’t remember the ID

Looks like Persicaria barbata (L.) H. Hara


Polygonacae Fortnight: Persicaria barbata (L.) H.Hara – from Assam KD MAY10 : 1 post by 1 author. Attachments (5).
Attached images are Persicaria barbata (L.) H.Hara collected from Assam. 


Persicaria barbata (?) from Kamrup district(Rural), Assam:
Are attached images Persicaria barbata (syn. Polygonum barbatum) ? Please confirm the ID.
Date :06/11/12
Location: Mirza [Dist- Kamrup(Rural)]
Habitat: Grows wild
Habit :Herb
Flower : Small, white in colour

Yes! It looks like Persicaria barbata L. (Polygonaceae) to me too.


Persicaria barbata (L.) H. Hara
photographed from Delhi

Polygonaceae Fortnight: Persicaria sp. for ID from Baijnath Uttarakhandr-GSMAY46 : 2 posts by 2 authors. Attachments(3).
Persicaria sp. photographed from Baijnath in Uttarakhand. Pl. help in ID.

Persicaria barbata (L.) Hara

Polygonaceae Fortnight- Persicaria barbata from Panipat:: NS May 33 : 3 posts by 2 authors. Attachments (6).
This is a common water weed of our area, I hope the id is right if I say this is Persicaria barbata..

Yes! P. barbata.


ANDEC06 Persicaria sp. for identification  : 3 posts by 2 authors. Attachments (4)

October 2014

Persicaria barbata (L.) H.Hara


Persicaria barbata (L.) H.Hara SN 15Feb 03  : 1 post by 1 author. Attachments (2)
Persicaria barbata (L.) H.Hara (= Polygonum barbatum L.), erect undershrub in he canal margins,
leaves with characteristic dark green patches at the middle, flowers white, smaller then P. glbra


Hooghly : Persicaria1 21-05-13 sk1 : Attachments (11).  3 posts by 2 authors.
Date/Time- 18/5/13, 2.50 pm
Location- Place, Altitude, GPS- Hooghly, what is GPS?
Habitat- Garden/ Urban/ Wild/ Type- wild
Plant Habit- Tree/ Shrub/ Climber/ Herb- herb
Height/Length- about 4 ft or more, might have another similar prostrate part
Leaves Type/ Shape/ Size- don’t know botanical terms
Inflorescence Type/ Size- 8 cm avg., can’t express type in botanical terms
Flowers Size/ Colour/ Calyx/ Bracts- white, size small, seems to have either no calyx or all calyx, what is bracts?
Fruits Type/ Shape/ Size Seeds- not seen
Other Information like Fragrance, Pollinator, Uses etc.- didn’t smell, common gull was there

Persicaria barbata (L.) H. Hara

Maybe Persicaria barbata as suggested by …



Herb for ID – efloraofindia | Google Groups

posting a snap of a herb growing the wilderness of Narendrapur- Shyamkhola near Kolkata.
Pic taken on 19th Sept. 2010.
Can someone plz  give the ID?

Polygonum barbatum !

Polygonum barbatum

Now Persicaria barbata (L.) Hara (syn: Polygonum barbatum L.)

This is common, possibly annual, in ditches or marshes.
Leaves subseesile, may be cordate, margin possibly serrulate (or with stiff hairs?) as can be seen in the 4th pic.; ochreal cilia equal to tube length.

Yes, I think the ID is correct.

Thanks for this post. I think  you need to recheck the ID for this plant. 

The Plant List mentions Persicaria decipiens (R.Br.) K.L. Wilson as the accepted name for Polygonum serrulatum Lag.
Moreover, your photos do not match with the images available on net:

Missed your feedback yesterday, didn’t receive email. Yes, I have seen the accepted name in The Plant List. But, I have deliberately used the name/entry in FBI or Bengal Plants or in Botany of Bihar and Orissa for reason I will explain eventually.

“Perianth color is variable and taxonomically less important (atleast in Persicaria)”
I think I can ignore what FoZ shows or displays. Please note :
  1. As per FBI/BP/BoBO perianth colour white in Indian plants
  2. raceme stout short
  3. leaves subsesiile and glabrous with slightly strigillose (or glabrous) margin
  4. cillia not longer than ochrea tube
Thank you

I agree that it doesn’t look like the one in FoZ, but at the same time neither the other uploads in eFI, except one which is not clear, looks like the one in FoZ !!!
There is an interesting account, on Polygonum serrulatum Lagasc., in Haines.
FoP has its say –
Perhaps, as FoP says, following taxa also need to be taken account of –

There is ample provision to get confused by the descriptions in the above links.
However, attached here some more photographs, that I think of the same plant species, recorded elsewhere in some other time.

The ID is wrong. A doc can be found on Indian species –
There is no Polygonum serrulatum Lagasc. in India, instead it is non Lag., synonym of Polygonum longisetum deBruyn and I am not sure if my plant or those of eFI can be same. It is getting very very complicated.

After all the discussion I think it should be Persicaria longiseta

Persicaria barbata (L.) H. Hara ??

Yes, appears more closer as per images at Persicaria barbata


294 ID wild plant Persicaria: 10 very high res. images.
Please ID wild plant,
Location: near Reserve Forest, Chathamattom, Ernakulam District, (Kochi) Kerala PIN:686671
Altitude: 1400fsl
Flower date: 20.02.2022, 01.55pm
Habitat: wild, moisture, marshy, river sandy beach
Plant habit: creeping, branches, slender weak fleshy stem 03mm base diameter, perennial
Height: 02 feet
Leaves: alternate, ovate, oblong, apex, purple shaded centre, mucus and lite tamarind when chewed, size up to:10×5cm
Flower: racemose straight upwards, clustered, diameter:01.5mm, pink, non fragrant
Camera: CANON EOS1500D

Persicaria barbata (L.) H.Hara or its sub sp. ???

Yes, it is Persicaria barbata, thank you very much for ID my plant,