Graptopetalum

Vázquez-García, J. Antonio, Acevedo-Rosas, Raúl, Cházaro-Basáñez, Miguel, Nieves-Hernández, Gregorio & Sahagún-Godínez, Eduardo, 2021, Graptopetalum rosanevadoensis (Crassulaceae): A new haplostemonous species from the Nevado de Colima, Jalisco, Mexico, Phytotaxa 496 (2), pp. 159-169 : 168

Key to the species of Haplostemonous Graptopetalum

1. Plants with rosettes less than 6 cm diameter, oblanceolate leaves and less of 2 cm long .................................................... G. glassii

- Plants with rosettes more than 6 cm diameter, obovate to oblong-obovate leaves and more of 2 cm long.......................................2

2. Rosettes less than 8 cm diameter, obovate leaves and until 4 cm long ....................................................................... G. pentandrum

- Rosettes more than 8 cm diameter, oblong-obovate leaves and more than 5 cm long.......................................................................3

3. Inflorescence branches 6 or less, inflorescence length until 27.5 cm .................................................................. G. rosanevadoensis

- Inflorescence branches 12 or more, inflorescence length until 40 cm ............................................................................ G. superbum