Persicaria decipiens

Common name: Willowleaf Knotweed, Willow-Leaved Knotgrass
Persicaria glabra (Willd.) M.Gomez is a common wild herb along drainage channels in Pantnagar.
Shot at Pantnagar, Uttarakhand.
Could you please share some more pics here Sir? Somehow it looks more like P. barbata to me. Not sure though.
Yes with your observation and following post by ...;
it resemble to P. barbata.
It is quite common nowadays here and I will post new pics soon in the same thread to conclude the correct ID.
Thank you ... for correcting the ID. It is P.barbata var. gracilis vide eFlora Pakistan-
However, the image on the same page in Annotated Checklist of the Flowering Plants of Nepal
have a different Ochrea. Must be a different var.
Attaching few more pics to show ochrea, leaf margin cilia, ochreolae and nuts.
Welcome to this eFI group ...
It seems that I am the first person directly benefited by your expertise in Polygonum s.l.
Thank you for indicating towards important characters of P.serrulata which is now known as P.decipiens (R.Br.) K.L.Wilson as per The Plant List 2013.
If I am not wrong it is the same species once known as Persicaria salicifolia (Brouss. ex Willd.) Munshi & Javeid.
I also consulted a century old (but still relevant) Flora of Upper Gangetic plains which differentiates P.barbatum and P.serrulatum as-
Lvs tapering to the acute base, marginal cilia of ochreae longer than tube................................Polygonum barbatum
Lvs tapering to rounded or subcordate base, marginal cilia of ochreae not longer than tube........Polygonum serrulatum
Accordingly my plant is P.serrulatum. eFlora Pakistan does not has this species and I wrongly concluded to P.barbata.
I hope the ID is now fixed to Persicaria decipiens (R.Br.) K.L.Wilson (=Persicaria serrulata);
Thanks to ...
5 posts by 4 authors. Attachments (5).
Perhaps Persicaria hydropiper photographed from near Dakpathar in Uttarakhand.
Please validate or give correct ID  
efi page on Persicaria hydropiper  
Inflorescence is usually lax in P. hydropiper.. here it is dense. I can also see faint red blotches on leaf in the first photograph... which are not found in P. hydropiper. More characters (i.e. nuts and perianth) should be checked for the proper ID.
Comments are welcome.
In light of the discussion in another thread
it resembles to the species Persicaria decipiens (=Persicaria serrulata).