This name is a synonym of Pilea rivularis Wedd..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50006246) with original publication details: Bull. Jard. Bot. Belg. 47: 255 1977.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:892245-1.
This name was in version 1 of The Plant List, record tro-50006246.