A taxonomic revision of the Cotula barbata group (Anthemideae, Cotulinae, Asteraceae)

•Seven species recognized.•One new species described (Cotula tuberculata Jakoet & Magee).•Cotula melaleuca Bolus is here reduced into synonymy with C. barbata DC.•C. leptalea DC. and C. tenella E Mey ex DC. are here reduced into synonymy with C. laxa DC.•Detailed morphological descriptions, typification, illustrations of diagnostic characters and distribution maps indicating the known geographical ranges of these species are included.