Angola | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Burundi | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Cameroon | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Colombia | Antioquia | | Idárraga-Piedrahita, A., R. del C. Ortiz, R. Callejas Posada & M. Merello | 2011 | Listado de las plantas vasculares del departamento de Antioquia | Fl. Antioquia: Cat. | 2: 9–939 |
Gabon | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Guinea | | | Lorence, D. H. | 1999 | A nomenclator of Mexican and Central American Rubiaceae | Monogr. Syst. Bot. Missouri Bot. Gard. | 73: 1–177 |
Honduras | | | Molina R., A. | 1975 | Enumeración de las plantas de Honduras | Ceiba | 19(1): 1–118 |
Kenya | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Sudan | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Tanzania | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Uganda | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |
Zaire (please use Democratic Republic of the Congo) | | | Bridson, D.M. & B. Verdcourt | 1988 | Rubiaceae (part 2) | Fl. Trop. E. Africa | 415–747 |