Sesbania is circumscribed by some authors to include sections Daubentonia and Glottidium. Others consider these sections as distinct genera closely related to Sesbania. Most recently, Glottidium has been treated as a monotypic genus and Daubentonia retained as a section of Sesbania. Comparative anatomy of cotyledons, leaves, and pericarps of species of Glottidium, Daubentonia and Sesbania (sensu stricto) from the southeastern United States reveals numerous shared character states; however, pericarp anatomy distinguishes Glottidium from the other taxa. These results are consistent with the segregation of Glottidium and the retention of Daubentonia within Sesbania.