This name is a synonym of Catharanthus roseus var. angustus (Steenis) Bakh..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 35721) with original publication details: Adansonia n.s., 12: 222 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:874313-1.
This name was in version 1 of The Plant List, record kew-35721.