J. J. (John James) Thornber

John James Thornber was an American botanist and teacher whose career was closely tied to the University of Arizona and the Arizona Agricultural Experiment Station. After earning his master's degree in botany from the University of Nebraska in 1901, he moved straight into a dual role in Tucson as Professor of Biology at the University of Arizona and botanist for the experiment station.

He became an important early scholar of Southwestern plant life, especially grasses, rangelands, and cacti. The University of Arizona Herbarium credits him with contributing roughly 10,000 records to its collections, and Nebraska Authors notes that he remained active and influential even after his partial retirement in 1942.

As a writer, Thornber produced a wide range of practical and popular works, from agricultural bulletins to accessible books on desert plants. He is especially associated with studies of Arizona forage plants and cacti, and he also co-authored Field Book of Western Wild Flowers, helping introduce a wider audience to the rich plant life of the American West.