Olsen, R.T.; Kirkbride, J.H. 2017: Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia 69(3): 387–421.
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| Olsen, R.T.; Kirkbride, J.H. 2017: Taxonomic revision of the genus Catalpa (Bignoniaceae). Brittonia 69(3): 387–421. |