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. 



Community Involvement to Address a Long-standing Invasive Species Problem: Aspects of Civic Ecology in Practice (with Kelly Harris and Mark Adler), Ecological Restoration (2015)

Invasive non-native species (INS) are found in every city around the globe, but their impacts...



Changes in Plant Species Composition and Structure in Two Peri-urban Nature Preserves over 10 Years (with Jessica D. Stepens and Marcia E. Moore), American Midland Naturalist (2015)

Peri-urban natural areas, at the boundaries of cities and adjacent agricultural/rural land, are subject to...



Two Hundred Years of Forest Change: Effects of Urbanization on Tree Species Composition and Structure, Arboriculture & Urban Forestry (2015)

Despite their importance, the dynamics of urban floras are not well understood and quantitative historical...



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...