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

A preliminary taxonomic revision treats the North American members of the cactus family and allied genera by comparing herbarium material and field-collected specimens, offering concise species descriptions, synonymies, and distributional notes. It discusses challenges posed by incomplete or cultivated types, sparse flowering material, and confusing historical descriptions, and proposes clearer species delimitations where possible. The author documents methods, lists examined collections, and emphasizes the need for more thorough fieldwork and better-preserved specimens to resolve persistent nomenclatural and taxonomic uncertainties.