Anne Orth Epple is the author of eleven books. She and her husband, Lewis E. Epple, spent five years photographing, researching, and writing about the 900 plants in this guide. Anne is a retired flower show judge, lecturer, and award-winning flower designer.


John F. Wiens, the updater, has a BS in Agricultural Science and has worked in the botany department at the Arizona-Sonora Desert Museum since 1985. He has helped edit and has contributed to multiple botanical books and journals.