References
Olsen, R.T., and J.H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia 69: 387-421. Google Scholar
Olsen, R.T., and J.H. Kirkbride, Jr. 2017. Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia 69: 387-421. Google Scholar