| Argentina | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Brazil | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Brazil | | | Forzza, R. C. | 2010 | (none) | Lista de espécies Flora do Brasil | http://floradobrasil.jbrj.gov.br/2010 |
| Caribbean | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Chile | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Colombia | | | Luteyn, J. L. | 1999 | Páramos, a checklist of plant diversity, geographical distribution, and botanical literature | Mem. New York Bot. Gard. | 84: viii–xv, 1–278 |
| Costa Rica | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Costa Rica | | | Luteyn, J. L. | 1999 | Páramos, a checklist of plant diversity, geographical distribution, and botanical literature | Mem. New York Bot. Gard. | 84: viii–xv, 1–278 |
| Ecuador | | | Luteyn, J. L. | 1999 | Páramos, a checklist of plant diversity, geographical distribution, and botanical literature | Mem. New York Bot. Gard. | 84: viii–xv, 1–278 |
| Ecuador | | | Jørgensen, P. M. & S. León-Yánez | 1999 | Catalogue of the Vascular Plants of Ecuador | Monogr. Syst. Bot. Missouri Bot. Gard. | 75: i–viii, 1–1181 |
| Ecuador | | | Jørgensen, P. M. & C. Ulloa Ulloa | 1994 | Seed plants of the high Andes of Ecuador—A checklist | AAU Rep. | 34: 1–443 |
| Guyana | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Mexico | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Panama | | | Luteyn, J. L. | 1999 | Páramos, a checklist of plant diversity, geographical distribution, and botanical literature | Mem. New York Bot. Gard. | 84: viii–xv, 1–278 |
| Paraguay | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Peru | | | Luteyn, J. L. | 1999 | Páramos, a checklist of plant diversity, geographical distribution, and botanical literature | Mem. New York Bot. Gard. | 84: viii–xv, 1–278 |
| Uruguay | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Venezuela | | | Taylor, C. M., B. E. Hammel & D. H. Lorence | 2014 | Rubiaceae. En: Manual de Plantas de Costa Rica. Vol. VII. B.E. Hammel, M.H. Grayum, C. Herrera & N. Zamora (eds.) | Monogr. Syst. Bot. Missouri Bot. Gard. | 129: 464–779 |
| Venezuela | | | Luteyn, J. L. | 1999 | Páramos, a checklist of plant diversity, geographical distribution, and botanical literature | Mem. New York Bot. Gard. | 84: viii–xv, 1–278 |