Etter, J., Vázquez-García, J. A., & Rosales-Martínez, C. S. (2022).

Graptopetalum kristenii (subg. Glassia, Crassulaceae), a new haplostemonous species from Michoacán, Mexico

. Phytotaxa, 555(2), 136–146. https://doi.org/10.11646/phytotaxa.555.2.2