Pentzia (Asteraceae-Anthemideae) in the Horn of Africa region

The two new species Pentzia somalensis , from areas of gypseous soil in northern Somalia, and P. arabica from the limestone plateau of Hadramaut in southern Yemen, are described and illustrated. P. somalensis is the only member of Anthemideae known from Somalia, and the occurrence of Pentzia on both sides of the Gulf of Aden in the Horn of Africa region represents a major extension of the distribution of the genus that is otherwise restricted to southern Africa except for two species in Morocco, Algeria and Tchad.