Psilostrophe Tagetinae and Psilostrophe Gnaphalodes, Two Plants Poisonous to Sheep and Cattle on the Ranges of the Southwest
George Stronach Fraps, Ivan Bertrand Boughton, Letcher P. Gabbard, Frederick Driggs Fuller, Roy Harrison Stansel, Frank Patrick Mathews, Mary Anna Grimes, William E. Paulson
