This name is a synonym of Impatiens mackeyana subsp. zenkeri (Warb.) Grey-Wilson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 3100144) with original publication details: Bot. Jahrb. Syst. 22: 51 1895.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:374424-1.
This name was in version 1 of The Plant List, record tro-3100144.