Rhynchoglossum azureum (Schltdl.) B.L. Burtt in Notes Roy. Bot. Gard. Edinburgh 24(2): 168. 1962 sec. Ramírez-Roa 2011
- ≡Klugia azurea Schltdl., Linnaea 8: 248. 1833 syn. sec. Ramírez-Roa 2011
- =Klugia grandiflora Fritsch, Akad. Wiss. Wien Sitzungsber., Math.-Naturwiss. Kl., Abt. 1, 135: 287. 1926 syn. sec. Skog & Boggan 2007
- =Rhynchoglossum grandiflorum (Fritsch) B.L. Burtt in Notes Roy. Bot. Gard. Edinburgh 24(2): 169. 1962 syn. sec. Skog & Boggan 2007
- =Rhynchoglossum violaceum (Fritsch) B.L. Burtt in Notes Roy. Bot. Gard. Edinburgh 24(2): 169. 1962 syn. sec. Skog & Boggan 2007