This name is a synonym of Lobelia trullifolia subsp. rhodesica (R.E.Fr.) Thulin.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 352923) with original publication details: Wiss. Erg. Schwed. Rhod.-Kongo Exped. 1: 316 1916.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:143772-1.
This name was in version 1 of The Plant List, record kew-352923, and has not been changed.