Emmet J. Judziewicz is a professor of biology and director of the Robert W. Freckmann Herbarium at the University of Wisconsin–Stevens Point and coauthor with Merel R. Black of Wildflowers of Wisconsin and the Upper Midwest.Robert W. Freckmann is a professor emeritus of biology at the University of Wisconsin–Stevens Point.Lynn G. Clark is the director of the Iowa Ada Hayden Herbarium and a professor of biology at Iowa State University.Merel R. Black is a research associate at the University of Wisconsin–Stevens Point and manages the ""Plants of Wisconsin"" website. The late Elsie H. Froeschner drew most of the illustrations, and the late Anna Gardner took many of the habit and spikelet photographs.