SK 3243 19 December 2021: 2 very high res. images.
Persicaria longiseta (Bruijn) Kitag. ??
Persicaria muricata (Meisn.) Nemoto ? Does elevation match ?
By the way do we have an updated journal on persicaria ?
Tried many species, but was unable to find a match.
Looks different from Persicaria muricata as per Wikimedia Commons and POWO.
Without detailed floral images (preferably macro), it is difficult for me to confirm at the species level.