Psychotria mexiae Standl. in Publ. Field Columb. Mus., Bot. Ser. 4: 296. 1929 sec. Lorence 2011
- =Palicourea nigrescens M. Martens & Galeotti in Bull. Acad. Roy. Sci. Bruxelles 11(1): 136. 1844 syn. sec. Borhidi 2006
- =Psychotria nigrescens De Wild., Pl. Bequaert. 2: 393. 1924 syn. sec. Borhidi 2006
- =Psychotria schippii Standl. & Steyerm. in Publ. Field Mus. Nat. Hist., Bot. Ser. 23: 24. 1943 syn. sec. Borhidi 2006