This name is a synonym of Isolona zenkeri (Engl.) Dyer.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Notizbl. Königl. Bot. Gart. Berlin 2: 301 1899.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:74151-1.
This name was in version 1 of The Plant List, record kew-2365390, and has not been changed.