]> Botany [collector note: Herbarium of Iowa State College of Agriculture and Mechanic Arts. Minnesota, USA] Pammel, Louis Hermann, Pammel, Harold E. & McNutt, P. S. Pammel, Louis Hermann, Pammel, Harold E. & McNutt, P. S. L. H. Pammel, H. E. Pammel & P. S. McNutt Pammel, L. H., Pammel, H. E. & McNutt, P. S. Louis Hermann Pammel, Harold E. Pammel & P. S. McNutt