This name is a synonym of Humularia welwitschii var. gossweileri (Baker f.) P.A. Duvign..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13060652) with original publication details: J. Bot. 46: 113 1908.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:495826-1.
This name was in version 1 of The Plant List, record tro-13060652, and has not been changed.