This name is a synonym of Humularia mendoncae (Baker) P.A.Duvign..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13060684) with original publication details: Bol. Soc. Brot., sér. 2, 8: 105 1933.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:495839-1.
This name was in version 1 of The Plant List, record tro-13060684, and has not been changed.