Taxonomy of the Cactaceae: a new classification of cacti based on molecular research and fully explained. Volumes 3 - 6. 2026. 13.500 ol. figs. 2434 p. 4to.. Hardcover. In English.

Volumes 1 -2 dealt with genera, while volumes 3 to 6 deal with species. Volumes 1-2 are out of print. Volumes 3 - 6 are sold as set only.

The most recent classification of cactus species and subspecies, mostly based (but not uniquely) on molecular genetics (DNA) and explained, with the latest discoveries.
No book on cacti has ever gone this far with illustrations, both in quantity (+18,000 photos) and quality, but also in diversity, with plants photographed in habitat and collections at different stages of growth, also with flowers, fruits and even seeds photographed with a digital microscope!
The eponyms are also illustrated with their portraits.

190 genera, 2,860 species and subspecies recognised, all described, explained and photographed in alphabetical order, Tribes and Subtribes, Grammatical genders, Sphalmates, Seeds illustrated for every species, description of habitats for every species and subspecies, +1,000 portraits of eponyms, 30 country maps, glossary, bibliography (+1,230 citations), index and synonyms.