This name is a synonym of Chionanthus mannii subsp. congestus (Baker) Stearn.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 353249) with original publication details: Fl .Trop. Afr. 4(1): 20 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:610186-1.
This name was in version 1 of The Plant List, record kew-353249, and has not been changed.