| 1 | Native | Northern America | South-Central U.S.A. | United States | Texas | e. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Alabama | s. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Arkansas | s. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Florida | n. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Georgia | s. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Louisiana | s. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 1 | Native | Northern America | Southeastern U.S.A. | United States | Mississippi | s. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 2 | Cultivated | | | | | also cult. | Olsen, R. T. & J. H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia [20-24]. |
| 4 | Naturalized | Europe | Southeastern Europe | Italy | | | Greuter, W. et al., eds. 1984-. Med-Checklist. |
| 4 | Naturalized | Northern America | Eastern Canada | Canada | Ontario | s.e. | Scoggan, H. J. 1978-1979. The flora of Canada, 4 vol. |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Illinois | | Mohlenbrock, R. H. & D. M. Ladd. 1978. Distribution of Illinois vascular plants |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Iowa | | Eilers, L. J. & D. M. Roosa. 1994. The vascular plants of Iowa |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Kansas | e. | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: mentions |
| 4 | Naturalized | Northern America | North-Central U.S.A. | United States | Nebraska | | McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains. Note: mentions |
| 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: mentions |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Connecticut | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Indiana | | Deam, C. C. 1940. Flora of Indiana. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Massachusetts | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 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 | | Ohio Flora Committee (E. L. Braun, T. S. Cooperrider, T. R. Fisher, J. J. Furlow). 1967-. The vascular flora of Ohio. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Pennsylvania | | Wherry, E. T. et al. 1979. Atlas of the flora of Pennsylvania. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Rhode Island | | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 4 | Naturalized | Northern America | Northeastern U.S.A. | United States | Vermont | s. | Magee, D. W. & H. E. Ahles. 1999. Flora of the Northeast. A manual of the vascular flora of New England and adjacent New York. |
| 4 | Naturalized | Northern America | South-Central U.S.A. | United States | Texas | | Turner, B. L. et al. 2003. Atlas of the vascular plants of Texas. Sida Botanical Miscellany no. 24 |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Arkansas | | Smith, E. B. 1978. An atlas and annotated list of the vascular plants of Arkansas |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Kentucky | | Jones, R. L. 2005. Plant life of Kentucky: an illustrated guide to the vascular flora. |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Maryland | | Brown, R. G. & M. L. Brown. 1972. Woody plants of Maryland |
| 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. |
| 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. |
| 4 | Naturalized | Northern America | Southeastern U.S.A. | United States | Tennessee | | Chester, E. W. et al. 1993-1997. Atlas of Tennessee vascular plants. |