Coryphantha difficilis
Coryphantha difficilis in Cactography: 3. 1926 sec. Sánchez & al. 20221
- ≡Mammillaria difficilis in Monatsschr. Kakteenk. 18: 107. 1911 syn. sec. Guzmán Cruz & al. 20032
- 1. Sánchez, D., Vázquez-Benítez, B., Vázquez-Sánchez, Aquino, D. & Arias, S. 2022: Phylogenetic relationships in Coryphantha and implications on Pelecyphora and Escobaria (Cacteae, Cactoideae, Cactaceae). – PhytoKeys 188: 115-165. http://doi.org/10.3897/phytokeys.188.75739, 2. Guzmán Cruz, L. U., Arias, S. & Dávila, P. 2003: Catálogo de Cactáceas Mexicanas. – Mexico, D. F.: Universidad National Autónoma de México & CONABIO
- =Coryphantha densispina in Repert. Spec. Nov. Regni Veg. 30: 57. 1932 syn. sec. Guzmán Cruz & al. 20033