| 1 | Native | Northern America | North-Central U.S.A. | United States | Illinois | | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 1 | Native | Northern America | North-Central U.S.A. | United States | Missouri | | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 1 | Native | Northern America | Northeastern U.S.A. | United States | Indiana | s.w. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 1 | Native | Northern America | South-Central U.S.A. | United States | Texas | n.e. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Arkansas | | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Kentucky | | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Tennessee | | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 2 | Cultivated | | | | | also cult. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [24-26]. |
| 4 | Naturalized | Northern America | Eastern Canada | Canada | Ontario | s.e. | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Iowa | | Eilers, L. J. & D. M. Roosa. 1994. The vascular plants of Iowa Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Kansas | e. & c. | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Missouri | | Yatskievych, G. 1999-. Steyermark's Flora of Missouri, revised edition Note: lists as Catalpa speciosa Warder ex Engelm. |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Nebraska | e. | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | North Dakota | Cass Co. | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Oklahoma | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | South Dakota | e. | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Wisconsin | | Wetter, M. A. et al. WISFLORA: Wisconsin vascular plant species (on-line resource). Note: lists as Catalpa speciosa (Warder ex Barney) Warder ex Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Connecticut | | Voss, E. 1972-. Michigan flora. Note: lists as Catalpa speciosa (Warder) Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Massachusetts | | Voss, E. 1972-. Michigan flora. Note: lists as Catalpa speciosa (Warder) Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Michigan | | Voss, E. 1972-. Michigan flora. Note: lists as Catalpa speciosa (Warder) Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | New Hampshire | | Voss, E. 1972-. Michigan flora. Note: lists as Catalpa speciosa (Warder) Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | New York | | Mitchell, R. S., ed. 1986. A checklist of New York state plants. New York State Mus. Bull. 458 |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Ohio | | Voss, E. 1972-. Michigan flora. Note: lists as Catalpa speciosa (Warder) Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Pennsylvania | | Voss, E. 1972-. Michigan flora. Note: lists as Catalpa speciosa (Warder) Engelm. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | West Virginia | | Strausbaugh, T. D. & E. L. Core. 1978. Flora of West Virginia, ed. 2. Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Georgia | | Radford, A. E. et al. 1964. Manual of the vascular flora of the Carolinas. Note: lists as Catalpa speciosa Warder ex Engelm. |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Maryland | | Brown, R. G. & M. L. Brown. 1972. Woody plants of Maryland Note: lists as Catalpa speciosa Warder |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | North Carolina | | Radford, A. E. et al. 1964. Manual of the vascular flora of the Carolinas. Note: lists as Catalpa speciosa Warder ex Engelm. |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | South Carolina | | Radford, A. E. et al. 1964. Manual of the vascular flora of the Carolinas. Note: lists as Catalpa speciosa Warder ex Engelm. |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Virginia | | Radford, A. E. et al. 1964. Manual of the vascular flora of the Carolinas. Note: lists as Catalpa speciosa Warder ex Engelm. |