There were 5 accepted species found [distribution filter:
2 Acokanthera oblongifolia (Hochst.) Benth. & Hook.f. ex B.D.Jacks. distributionfilter: global
homotypic synonyms:
Acokanthera oblongifolia species (Hochst.) Codd;
Carissa oblongifolia Hochst.; heterotypic synonyms:
Carissa spectabilis (Sonder) Pichon;
Toxicophlaea spectabilis Sonder;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
4 Acokanthera rotundata (Codd) Kupicha distributionfilter: global
homotypic synonyms:
Acokanthera schimperi variety rotundata Codd; links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
5 Acokanthera schimperi (A. DC.) Schweinf. distributionfilter: global
homotypic synonyms:
Acokanthera schimperi species (A. DC.) Benth. & Hook.f.;
Arduina schimperi (A. DC.) Baillon;
Carissa schimperi A. DC.; heterotypic synonyms:
Carissa deflersii (Schweinf. ex Lewin) Pichon;
Carissa friesiorum (Markgr.) Cufod.;
Carissa inepta Perrot & Vogt;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr