Persicaria hydropiper (L.) Delarbre, Fl. Auvergne ed. 2: 518 1800. (syn: Persicaria acris Gilib. (Unresolved); Persicaria hydropiper (L.) Opiz; Persicaria hydropiper (L.) Spach; Persicaria hydropiper var. diffusa Kitag.; Persicaria hydropiper var. vulgaris (Meisn.) Ohki; Persicaria urens Garsault [Invalid]; Persicaria vernalis Nakai; Peutalis hydropiper Raf. (Unresolved); Polygonum hecasanthum Schur (Unresolved); Polygonum hydropiper L.; Polygonum hydropiper var. longistachyum Y.L. Chang & S.X. Li; Polygonum hydropiper var. projectum Stanford;  Polygonum hydropiper var. vulgare Meisn.; Polygonum koreense Nakai; Polygonum obtusifolium Schur (Unresolved); Polygonum oleraceum Schur (Unresolved); Polygonum schinzii J. Schust.);
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Temp. Eurasia to W. & Central Malesia, NW. Africa: Afghanistan, Albania, Algeria, Altay, Amur, Andaman Is., Assam, Austria, Azores, Baltic States, Bangladesh, Belarus, Belgium, Bulgaria, Buryatiya, Central European Rus, China South-Central, China Southeast, Chita, Corse, Czechoslovakia, Denmark, East European Russia, East Himalaya, Finland, France, Germany, Great Britain, Greece, Hainan, Hungary, India, Inner Mongolia, Iran, Ireland, Irkutsk, Italy, Japan, Jawa, Kazakhstan, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Krym, Kuril Is., Madeira, Malaya, Manchuria, Mongolia, Morocco, Myanmar, Nepal, Netherlands, Nicobar Is., North Caucasus, North European Russi, Northwest European R, Norway, Ogasawara-shoto, Pakistan, Philippines, Poland, Portugal, Primorye, Qinghai, Romania, Sakhalin, Sardegna, Sicilia, South European Russi, Spain, Sri Lanka, Sumatera, Sweden, Switzerland, Tadzhikistan, Taiwan, Thailand, Tibet, Transcaucasus, Turkey, Turkey-in-Europe, Tuva, Ukraine, Uzbekistan, Vietnam, West Himalaya, West Siberia, Xinjiang, Yugoslavia as per POWO;
..

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Polygonaceae Fortnight: Persicaria lapathifolia from Kashmir-pl validate-GSMAY37 : 4 posts by 2 authors. Attachments (4).
Perhaps Persicaria lapathifolia, photographed along Nagin Lake in Kashmir, please validate.

As per my observations, inflorescence are densely flowered and not interrupted in P. lapathifolia.
I would rather go with P. hydropiper here.
Comments are welcome.


Thanks …
Good that I am uploading plants from different places separately, especially when there is some doubt.


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Polygonaceae Fortnight : 1 – 14 May 2014 : Persicaria hydropiper : Pahalgam,Kashmir : 140514 : AK-15 : 3 posts by 2 authors. Attachments (1).
Seen in Pahalgam, during visit in Sept, 2011.

Glabrous stem, lax inflorescence with white to pink perianth pointing to P. hydropiper.



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Wild Plant for ID : Pahalgam : 191112 : AK-2: Picture taken on 8/9/2011 in Pahalgam.
Seen growing wild by the roadside.
Polygonum?

May be Polygonum hydropiper L.


Yes Persicaria hydropiper (syn: Polygonum hydropiper).



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Hooghly Today : Persicaria hydropiper L. :  Attachments (8). 2 posts by 2 authors.


Excellent photographs of both flora and the insect.


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Hooghly today – Persicaria hydropiper (L.) Spach :  Attachments (10). 1 post by 1 author.
This seems to be Persicaria hydropiper (L.) Spach
(FoC)(FoP).



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Persicaria hydropiper (L.) Spach
Persicaria hydropiper L.
Photographed from Manali


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HP, Oct 2014 :: Requesting ID validation – Persicaria hydropiper :: ARKDEC-37 : 2 posts by 2 authors. Attachments (7).
Requesting to please validate ID of this Persicaria captured near Manali, HP in October 2014.
I hope this is Persicaria hydropiper (based on FoI pics).


In old threads I have been told that P. hydropiper has lax flowered inflorescence. FoC or FoP also supports that. Yet overall looks of this plant is like that of P. hydropier – http://herbier.sesa-aude.fr/Polygonum-hydropiper. Please ensure leaf base is cuneate which is not clear in the attached pictures.


Thanks … for the info….
I am uploading a cropped pic of the leaf base…
Attachments (1)



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Persicaria hydropiper (L.) Spach (accepted name) ??? : 6 posts by 2 authors. Attachments (4)
Location: Kurintar, Nepal
Date : 12 April 2012
Altitude : 900 ft.

Is ID correct?


I also think, these appear closer to images at Persicaria hydropiper


Nepali Names : पिरे Pire / रत्नाउलो Ratnaaulo


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Manali, Himachal Pradesh on October 22, 2009; Bhadreshwar, Hooghly, West Bengal: 15/12/2007; Persicaria hydropiper from Manali – efloraofindia | Google Groups


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Persicaria hydropiper ABAUG2017/39 : 2 posts by 2 authors. Attachments (14)

These plants are flanking the roadside wherever there is running rainwater. The plants I photographed are growing next to cultivated fields. These are about three-feet tall and growing in clusters. I think this is Persicaria hydropiper but I am not entirely sure. Please advise.

Persicaria hydropiper?
Near Dal Lake, Dharamshala, HP
1800m approx.
26 August 2017

Your efforts to bring out such details are really to be admired.



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References:

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