Prometheum rechingeri, a new report from Iran

In the course of the study of collected specimens from West Azerbaijan province (NW Iran), Prometheum rechingeri (Crassulaceae) is reported for the first time from Iran. Based on recent phylogenetic and morphological studies in Crassulaceae family, genus Prometheum was considered as independent genus. So far, two species viz. P. pilosum (under Sedum pilosum), and P. sempervivoides (under S. sempervivoides) has been reported from Iran. These two species and the new report are specific to mountains regions and they mostly occur at elevation above 2000 m.s.l. in the northwest of Iran (West and East Azerbaijan provinces). A short discussion on the taxonomic history of the genus Prometheum and the relative species, description, distribution, illustration, ecology and a key for existing three Iranian species is provided.