Dear Alok Ji, Tanay ji is right.This is not P. vivipara.
For me, it is difficult to say anything without examining the plant more closely. Because, the characteristic pubescence, ochrea, stamens, or nuts can't be seen here, but somehow it looks like Persicaria longiseta. In other case, P. posumbu. Providing links form flora of China for your convenience: http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242339605 http://www.efloras.org/object_page.aspx?object_id=50692&flora_id=2 Pl. check your specimens for these two. Or pl post more close-up shots of the above mentioned characters. Regards, Ritesh.
