John D. Byrd, Mississippi State University, Bugwood.org

John Cardina, The Ohio State University, Bugwood.org

Joseph M. DiTomaso, University of California - Davis, Bugwood.org

Chris Evans, University of Illinois, Bugwood.org

Chris Evans, University of Illinois, Bugwood.org

Wendy VanDyk Evans, Bugwood.org

Chris Evans, University of Illinois, Bugwood.org

John D. Byrd, Mississippi State University, Bugwood.org

Ken Chamberlain, The Ohio State University, Bugwood.org

USDA NRCS PLANTS Database , Bugwood.org