This name is a synonym of Polygonum lichiangense W.W. Sm..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50135202) with original publication details: Bull. Torrey Bot. Club 68(9): 675 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:696694-1.
This name was in version 1 of The Plant List, record tro-50135202, and has not been changed.