Grasses of Iowa is an on-going project of the Ecology, Evolution, and Organismal Biology Department at Iowa State University designed to provide to a broad audience–the general public and professionals alike–a handy resource for the identification and evaluation of grasses. Grasses are the most important family of plants on Earth, both ecologically and economically. The Iowa landscape was shaped largely by native tallgrass prairie. Today in Iowa, corn (maize) is one of our two major crops, and many of the weeds in our agricultural fields are grasses. Prairie reconstruction and the use of ornamental grasses are of increasing interest to midwesterners. The Grasses of Iowa project, in addition to providing a means to identify grasses, also presents information on the distribution and characteristics of grass species and contains numerous images of grasses and their habitats.