This name is a synonym of Phyllactis rigida (Ruiz & Pav.) Pers..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 33500386) with original publication details: Fl. Peruv. 1: 39, t. 65, f.c. 1798.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:286650-2.
This name was in version 1 of The Plant List, record tro-33500386, and has not been changed.