Books by A. Michael Powell
Cacti of Texas, a field guide
Cacti of Texas, a field guide
Cacti of the Trans-Pecos and Adjacent Areas
Ferns and Fern Allies of the Trans-Pecos and Adjacent Areas
Trees and shrubs of the Trans-Pecos and adjacent areas
Grasses of the Trans-Pecos and Adjacent Areas
Trees & shrubs of Trans-Pecos Texas
Additional discussions pertain
Additional discussions pertaining to the congeneric status of perityle and laphamia (Compositae)
Chromosome Numbers in the Comp
Chromosome Numbers in the Compositae