Persicaria lanata (Roxb.) N. N. Tsvelev in Novosti Sist. Vyssh. Rast. 25: 186. 1988.  (Syn: Polygonum lanatum Roxb.; Polygonum lanigerum auct. non R. Br.: Meisn.; Polygonum lapathifolium var. lanatum (Roxb.) Steward; Persicaria lapathifolia subsp. lanata (Roxb.) Sojak; Persicaria lapathifolia var. lanata (Roxb.) Hara) as per Flora of Pakistan;
.
Bulgaria to Caucasus, NW. Pakistan to NW. India and Myanmar: Assam, Bangladesh, Bulgaria, East Himalaya, India, Myanmar, North Caucasus, Pakistan, South European Russi, West Himalaya as per POWO;
.

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POLYGONACEAE FORTNIGHT 1-14 May 2014: Persicaria lapathifolia from Uttarakhand_DSR_8 : 5 posts by 3 authors. Attachments (1 + 1).
Persicaria lapathifolia (L.) Delarbre is a common semi aquatic herb in Pantnagar.
Unlike
Persicaria glabra, it is a taller herb reaching up to 4 feets.
Shot in Pantnagar, Uttarakhand.


Do you have some more images of this plant? The stem and leaf appears lanose to me. In that case this should be P. lapathifolium var. lanatum (as per Flora of China)
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006724


The synonymy in Polygonum seems confusing to me, led to this conclusion on identity.
Leaves are lanate as suspected by you. Attaching a picture of vegetative stage for your observation.


Yes! This is definitely not P. lapathifolia var. lapathifolia. This should be Persicaria lanata but still have to find how it differs from Polygonum lanigerum. Will check soon and let you know. Thanks again for sharing your valuable collection Sir!


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Polygonaceae Fortnight: Persicaria lanigera from Delhi-GSMAY35 : 3 posts by 3 authors. Attachments (2).

Persicaria lanigera (R. Br.) Sojac
syn: Polygonum lanigerum R. Br.
Avaery distinctive species of wet places easily identified by its white lanate leaves and terminal condensed inflorescence. Could capture it only in vegetative state.
Photographed from banks river Yamuna in Wazirabad, Delhi.

Thanks for sharing the images Sir! I’ve seen this plant in Dehra Dun..that too in vegetative stage. 🙁
Wondering how much it differs from P. lapathifolia var. lanosa. Yet to see in field.


I have also seen its flowers, it is a robust herb..


I could not find its distribution in India in POWOFlora of PakistanChecklist of Nepal and BSI flora of India.
However, CoL gives it as Victoria (I), Pakistan (Peshawar, Punjab), Egypt (Desert Oases, Nile Delta), Israel (coastal W-Israel, Rift Valley), Benin (I), Bhutan, Sikkim, Philippines (Luzon), Laos.


Appears close to images at Persicaria lanata (Roxb.) N. N. Tsvelev and as per GBIF specimens/ observations.


Hope to capture Inflorescence some day, that would solve the ID. Leaves I thought resemble P. lanigera more.


I just checked eFlora of Pakistan according to which Polygonum lanigerum of FBI is not same as that of R. Br. and is correctly Persicaria lanata. So I take it as P. lanata as suggested by … Thanks …
Persicaria lanata in Flora of Pakistan @ efloras.org



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ID of Polygonum!:
I require your help in identification of these varieties of polygonum.  The first three photos look very much different from the last snap polygonum4 which looks different.  I strongly suspect it to be Polygonum barbatum.  I require your help in identification of this variety of Polygonum.  Do help me out with this identification.


Please check for Polygonum glabrum (Persicaria glabra).


I am also thinking that this could be P. glabrum.
Please check the following;
Nut biconvex- P glabrum
Nut trigonous P. barbatum
But, according to gamble, there might be biconvex nuts among trigonous nuts so check for the presence trigonous nuts in the fruiting inflorescence.
Further,
Bracts not ciliate on the margins . P. glabrum.
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
Ocreae 1.5-2.5 cm, tubular, strigose (Having stiff, straight, closely appressed hair), with very long ciliae at the mouth- P barbatum
Hope this key would be helpful.

Leaves appear similar to those at Persicaria lanata (Roxb.) N. N. Tsvelev


Yes


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