Prometheum

Prometheum is a genus of plants in the family Crassulaceae.
Taxonomy.
The species in the genus "Prometheum" include:
"P. sempervivoides" and "P. pilosum" were historically included in genera "Sedum" (section "Cyprosedum"), and later "Rosularia", but were elevated to a separate genus by Ohba (1995).
Description.
According to an experiment done on interspecific plant crosses in the family Crassulaceae, the genus "Prometheum" produced on average 55 seeds. Furthermore, the same experiment found that plants of the genus "Prometheum" formed a comparium with each other, meaning they were capable of interbreeding.
Distribution and habitat.
From Anatolia to Iran, through the Caucasus.