| Woody plants of the eastern United States, including the identification, ecology, and biology of trees, shrubs, and woody vines. |
| Phytogeography and flora of the Florida panhandle and the greater Southeastern Coastal Plains. |
| Conservation and distribution of rare, endangered, and endemic plants of the Southeastern Coastal Plains, with special emphasis on the Florida panhandle and adjacent Georgia and Alabama. |
| Distribution, impact, and tracking of non-native, invasive plant species. |
| Garden use of native plants in residential and commercial landscapes. |
| Application of electronic relational database management systems to the management of biological/botanical data. |
