This name is a synonym of Polygonum affine D. Don.
The record derives from Tropicos which reports it as a synonym (record 50253458) with original publication details: Bot. J. Linn. Soc. 98, 368 98 1988.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:945902-1.