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My major research interest is the systematics and evolution of sedges (Cyperaceae), especially the large and complex genus Carex. I emphasize a multi-level approach concentrating on several aspects, including development of new characters useful in systematics, monographic studies of major groups, and processes and patterns of evolution. I am also conducting research on the biogeography of the northeastern North American flora, concentrating on the Great Lakes region. My primary interests here are plant migration and colonization, the origin and persistence of relict plant species and communities, and the biogeography and conservation of rare species
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