The Genus Acacia s.l. (Fabaceae) in Yemen

The current study aims to update the list and revise the nomenclature of Acacia s.l ., one of the most widespread genera in Yemeni flora. The study was compiled by consulting a number of information sources, including relevant literature and online databases. According to recent molecular phylogenetic studies, Acacia s.l . is polyphyletic and the recognition of seven genera is strongly supported. Hence the classical identity of Acacia needs to be changed. Therefore, the current position of different Acacia taxa presents in Yemen (including six endemics, one near-endemic and four regionally endemics), which was formerly assigned in Acacia s.l ., has been transferred to Acacia s.s . Vachellia and Senegalia . This has resulted in six species of Acacias , fifteen species with 7 subspecies and 2 varieties in Vachellia and six species in Senegalia.