I manage the 100,000 specimen Friesner Herbarium, a collection of pressed and dried
plant specimens that serve as a reference for study of the Indiana flora. I am working
with a group of botanists throughout the state to computerize our specimen records and to
produce an atlas of plant distributions. In addition, I am conducting field and
laboratory studies of rare native plants. I am also involved with a group studying the
success of a massive prairie restoration The Nature Conservancy is undertaking in
northwestern Indiana. I seek student involvement in database management, herbarium
operations, field checks of plant occurrences, and genetic studies using starch gel
electrophoresis of isozymes. 



A global analysis of the impacts of urbanization on bird and plant diversity reveals key anthropogenic drivers (with Myla F.J. Aronson, Frank A. La Sorte, Charles H. Nilon, Madhusudan Katti, Mark A. Goddard, Christopher A. Lepczyk, Paige S. Warren, Nicholas S.G. Williams, Sarel Cilliers, Bruce Clarkson, Cynnamon Dobbs, Marcus Hedblom, Stefan Klotz, Jip Louwe Kooijmans, Ingolf Kühn, Ian MacGregor-Fors, Mark McDonnell, Ulla Mörtberg, Petr Pyšek, Stefan Siebert, Jessica Sushinsky, Peter Werner, and Marten Winter), Proceedings Of The Royal Society B: Biological Sciences (2014)

Urbanization contributes to the loss of the world's biodiversity and the homogenization of its biota....



Beta diversity of urban floras among European and non-European cities (with Frank A. La Sorte, Myla F.J. Aronson, Nicholas S.G. Williams, Laura Celesti-Grapow, Sarel Cilliers, Bruce D. Clarkson, Andrew Hipp, Stefan Klotz, Ingolf Kühn, Pter Pyšek, Stefan Siebert, and Marten Winter), Global Ecology and Biogeography (2014)

Aim- Cities represent an ideal study system for assessing how intensive land-use change and biotic...



Trials of the urban ecologist (with Tim Carter, Travis J. Ryan, Carmen M. Salsbury, Thomas E. Dolan, and Marjorie Hennessy), Frontiers in Ecology and the Environment (2013)

A group of scientists describe some of the obstacles encountered and insights gained while carrying...



Documenting effects of urbanization on flora using herbarium records (with Marcia E. Moore and Jessica Stephens), Journal of Ecology (2011)

  1. As human populations increasingly live in cities, urban floras and the ecosystem services...



Living More Than Just Enough for the City: Persistence of High-Quality Vegetation in Natural Areas in an Urban Setting (with Jessica D. Stephens and Marcia E. Moore), Diversity (2011)

Urban environments pose special challenges to flora, including altered disturbance regimes, habitat fragmentation, and increased...