McDougal, W. B.
Checklist of Plants of Grand Canyon National Park. Bulletin No. 10. Grand Canyon Natural History Association, 1947.
Patraw, Pauline M. (Drawings by Jeanne R. Janish)
Flowers of the Southwest Mesas. Southwestern Monuments Association, Globe, Arizona, 1954.
Presnall, C. C. and Patraw, Pauline M.
Plants of Zion National Park. Bulletin No. 1. Zion-Bryce Natural History Association, 1937.
Preston, Richard J.
Rocky Mountain Trees. The Iowa State College Press, Ames, Iowa, 1947.
Saunders, Charles Francis
Western Wild Flowers and Their Stories. Doubleday, Doran Co., 1933.