Anemon elongata is recorded from Garwhal, so perhaps Dr Rawat has come across it in Uttarakhand? I think I have some images of what I think may be A.elongata somewhere, so shall look these out when I can. Such images (or any other members have) would represent a new entry for eFI.
A.elongata is recorded from near the top of Phulchoki mountain above Godawari, Nepal, in 'Flora of Kathmandu Valley' - according to this, its achenes are smaller than in A.rivularis more rounded and with straight beaks - the achenes in the first image above are immature and not fully in focus but have hooked beaks.