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