Dicht R.F., Luthy A.D. Coryphantha. Cacti of Mexico and Southern USA

Springer, 2005. — 206 s. — ISBN 3-540-22306-1.Needed nearly 15 years to solve the nomenclatural confusion of the genus Coryphantha and to write this monograph. With 338 Figures, Including 299 Colour Photos.Introduction to the Genus Coryphantha.
Morphology of Coryphantha.
History of the Genus Coryphantha.
Position and Delimitation of the Genus Coryphantha.
Key to the Genus Coryphantha.
The Genus Coryphantha - Descriptions of the Species.
Coryphantha spp. in Cultivation.Appendix.
Comparison Tables.
Synonyms and Valid Names.
Illustration Credits.