The book "Preliminary Reconsideration of the North American Species of Cacti, Angactia and Lophophora" by the author John Merle Coulter is an important scientific study devoted to a systematic review of the genera of cacti, Angactia and Lophophora growing in North America. The author highlights the classification, description and characteristics of these plants, and also provides a detailed overview of the current state of research in the field of culture and protection of these unique species. The book contains illustrations, tables and cartographic materials that will help the reader better understand the diversity and distribution of these plants in nature. "Preliminary reinterpretation of the North American species of cacti, Angactia and Lophophora" will be a useful source of information for botanists, ecologists and all those interested in the study of the plant world.