Persicaria hydropiper ?;

HP, Oct 2014 :: Requesting ID – Persicaria5 :: ARKDEC-40 : 6 posts by 3 authors. Attachments (6).
Requesting to please provide ID of this Persicaria species captured near Manali, HP in October 2014.

efi page on Persicaria minor (Naturalized)

Photo at Sr.No. 6 Looks as Polygonum hydropiper Jal marich.

The plant uploaded is Persicaria hydropiper variety elagans

To me appears more close to Persicaria glabra

Not P.glabra.. I’ll get back to you soon.

to me, it looks like Polygonum hydropiper, The leaf juice is pungent and strong-smelling. Crushed leaves are put into the deep pond inhabiting fish which forces the fish to come out from their hiding as the plant juice is irritating to the fish eyes Forms patches in moist, boggy places.

Thanks, … But looks different from Persicaria hydropiper as per images and details herein.

Though the plant P.glabra grow\s Also grows under a similar environmental niche,, the nodes have glabrous scales with rough hairy sheath enclosing the nodes.

Persicaria longiseta (Bruijn) Kitag. ??


Find below images of a population of Polygonum hydropiper from Dist. Mandi, Himachal Pradesh.

Thanks for sharing the photographs Sir! But somehow it doesn’t look like P. hydropiper to me. Could you please share some close shots?

The Photograph send by … is Persicaria serulata

To me appears more close to Persicaria glabra

With this photograph, it is difficult for me to confirm the ID. P. hydropiper has many allied species and they all look alike. Close up of the inflorescence and ochrea is required.

Persicaria longiseta (Bruijn) Kitag. ??


SK 2841 11 November 2020 : 7 very high resolution images.
Location: Kathmandu Valley
Date:  October 2020 
Elevation: 1500m.
Habitat  : Wild
Persicaria ….??? 

Most probably Persicaria hydropiper (L.) Delabre

Many allied species of the same are known. Therefore, we’ll need more photographs showing the floral characters to confirm the ID.

Pl. see all the high resolution images at SK 2841 11 November 2020

Yes, I saw that. Can’t see the open flowers there. Therefore, suggested the tentative ID.



Persicaria maculosa from Kashmir : Attachments (3). 4 posts by 3 authors.
Persicaria maculosa Gray (syn: Polygonum persicaria L.) from Kashmir, growing in wet places.
Photographed from Harwan on June 17, 2010.
Common names: Lady’s-thumb, Redshank, Spotted lady’s-thumb , Smart weed
French: Renouée persicaire

Used as medicinal as laxative, cardiac stimulant, and in colds and fevers. Infusion useful as a gargle in inflammation of pharynx. Herb yields an essential oil.

Just wanted to ask, how do you differentiate Persicaria from Polygonum?

The former complex genus has now been split into at least four major genera.

Here is a simpler key:
Flowers in axillary clusters (stamens inflated at base, inner larger; nectaries absent or inconspicuous)………………..Polygonum
Flowers in Panicles, Spikes or Heads (All stamens equal, not inflated at base; nectaries present and conspicuous)
Flowers in clusters forming panicle or flat-topped corymb………………………………………………………………………Koenigia
Flowers in well-defined spikes or heads
Plants rhizomatic perennials with prominent basal leaves; styles 3, free and elongate………………………………..Bistorta

Plants annual, rarely perennials with rooting branches; leaves evenly distributed; style 1, bifid or trifid…………….Persicaria

Reply from another thread :
Drooping inflorescence, absence of triangular spot on leaf and short cilia (cilia on P. maculosa are much longer) are insisting me NOT to go with P. maculosa. Rather it could be P. hydropiper or P. mitis. Can’t see number of stamens and nut character that could be critical.
Comments are welcome.
Thanks … I am uploading separately what I think to be P. mitis. You can compare them better.

… post on Persicaria mitis

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