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Brian C. McCarthy, Department of Environmental and Plant Biology, 315 Porter Hall, Ohio University, Athens, OH 45701.

Samantha Rich (corresponding author), University of Illinois at Urbana-Champaign, 13710 Burke Avenue N., Seattle, WA, .

Anne Shaffer, University of Victoria Biology Department, Victoria BC/Coastal Watershed Institute, P.O. Box 2263, Port Angeles, Washington 98362,

Miranda J. Fix, Colorado State University, Statistics Department, 102 Statistics Building, Fort Collins CO 80523, .

Jeffrey O. Dawson, University of Illinois at Urbana-Champaign, Plant Sciences Laboratory, 1201 S. Dorner Drive, Urbana, IL 61801, .

Hector E. Pérez, Plant Restoration and Conservation Horticulture Research Consortium, Department of Environmental Horticulture, University of Florida, P.O. Box 110675, Gainesville, FL 32611-0675, .

Laurelin M. Martin (corresponding author), Department of Biology, Grand Valley State University, Allendale, MI 49401-9403, .

Neil W. MacDonald, Department of Biology, Grand Valley State University, Allendale, MI 49401-9403.

Tami E. Brown, Department of Biology, Grand Valley State University, Allendale, MI 49401-9403.