A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora

"A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora" by John M. Coulter is a scientific publication written in the late 19th century. This work focuses on the taxonomy and classification of various species of cacti native to North America, particularly examining the genera Cactus, Anhalonium, and Lophophora. The text aims to provide a systematic framework to better understand the complexities and variations in this group of plants, encouraging further exploration and collection of specimens.