Abstract
Two little known species of Centaurea sect. Acrocentron from Algeria and Morocco have been studied. A phenetic analysis of two populations of these taxa, combined with other two species of the same section from South Spain, shows that the two North African taxa are actually a single species. A description and illustration of the species are included. A hybrid origin for three varieties in the same group described by Maire is suggested, and included in a new hybrid entity: Centaurea x renati Garciajacas & Susanna, nom. & stat. nov.
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