I think this is *Persicaria chinensis* (L.) H. Gross <https://efloraofindia.com/2011/03/20/persicaria-chinensis/>, as per images and details herein.
---------- Forwarded message --------- From: Shantanu <[email protected]> Date: Tuesday, July 5, 2011 at 10:29:37 PM UTC+5:30 Subject: A flower from Paren- North Bengal To: efloraofindia <[email protected]> Hi sharing the shot of a flower from Paren in north Bengal near Indo-Bhutan border. Pic taken on 6th June.2011. What flower is this? thanks Shantanu : ) -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/indiantreepix/bae9eb44-f57f-4173-85e2-1abaa7caf8adn%40googlegroups.com.

