| Bolivia | Beni | | Hauk, W. D. | 2002 | A review of the genera Roentgenia and Potamoganos (Bignoniaceae) | Ann. Missouri Bot. Gard. | 89(1): 77–87 |
| Bolivia | La Paz | | Parker III, T. A. & B. Bailey | 1991 | A biological assessment of the Alto Madidi region and adjacent areas of Northwest Bolivia | RAP Working Papers | 1: 1–108 |
| Bolivia | La Paz | | Hauk, W. D. | 2002 | A review of the genera Roentgenia and Potamoganos (Bignoniaceae) | Ann. Missouri Bot. Gard. | 89(1): 77–87 |
| Ecuador | | | Gentry, A.H. | 1977 | 178. Bignoniaceae | Fl. Ecuador | 7: 1–172 |
| Ecuador | | | Renner, S. S., H. Balslev & L.B. Holm-Nielsen | 1990 | Flowering plants of Amazonian Ecuador—A checklist | AAU Rep. | 24: 1–241 |
| 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 | Morona-Santiago | | Gentry, A.H. | 1977 | 178. Bignoniaceae | Fl. Ecuador | 7: 1–172 |
| Ecuador | Morona-Santiago | | Renner, S. S., H. Balslev & L.B. Holm-Nielsen | 1990 | Flowering plants of Amazonian Ecuador—A checklist | AAU Rep. | 24: 1–241 |
| Ecuador | Morona-Santiago | | 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 | Napo | | Gentry, A.H. | 1977 | 178. Bignoniaceae | Fl. Ecuador | 7: 1–172 |
| Ecuador | Napo | | Renner, S. S., H. Balslev & L.B. Holm-Nielsen | 1990 | Flowering plants of Amazonian Ecuador—A checklist | AAU Rep. | 24: 1–241 |
| Ecuador | Napo | | 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 | Pastaza | | Renner, S. S., H. Balslev & L.B. Holm-Nielsen | 1990 | Flowering plants of Amazonian Ecuador—A checklist | AAU Rep. | 24: 1–241 |
| Ecuador | Pastaza | | 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 | Sucumbíos | | 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 |
| Peru | | | Macbride, J. F. | 1961 | Bignoniaceae, Flora of Peru | Publ. Field Mus. Nat. Hist., Bot. Ser. | 13(5C/1): 3–101 |
| Peru | Loreto | | Macbride, J. F. | 1961 | Bignoniaceae, Flora of Peru | Publ. Field Mus. Nat. Hist., Bot. Ser. | 13(5C/1): 3–101 |