About thirty genera are within the Crassulaceae subfamily Sempervivoideae. A number of these have been at times, embedded within the very large genus Sedum s.s..
Alphabetical list of genera
Aeonium Aichryson Cremnophila Dudleya Echeveria Graptopetalum Hylotelephium Kungia Lenophyllum Meterostachys Monanthes Mucizonia Orostachys Pachyphytum Perrierosedum Petrosedum Phedimus Pistorinia Prometheum Pseudosedum Rhodiola Rosularia Sedella Sedum Sempervivum Sinocrassula Thompsonella Umbilicus Villadia
The genus Sedum constitutes about 50% of the species of the family Crassulaceae.
References
Bibliography
(full text at ResearchGate)