General: Plant ecology and conservation biology
Specific: 

• Applications of GIS technology to conservation biology
• Examination of factors controlling the distribution of rare and endangered plant species
• Reproductive biology of rare plants
• Assessment of the roles of competition, environmental stress, disturbance, and seed banks in determining the species composition and abundance in plant communities

Ruch, D.G., B.G. Torke, C.R. Reidy, P.E. Rothrock, R. Waltz, E.A. Urly, J.L. Chance, L. Click, and K.S. Badger. 2007. The Vascular Flora and Vegetational Communities of Hayes Arboretum, Wayne County, Indiana. Proceedings of the Indiana Academy of Science In Press