A Gordion knot in Ruschioideae (Aizoaceae):Acrodon and Brianhuntleya in an attempt to disentangle the confusion

The confusion of names and species boundaries in and between the genera Acrodon and Brianhuntleya, resembling a Gordion knot, is analysed on the base of new collections, images from habitat and cultivation, and many new investigations into the character sets of most features. The genera are newly delimited against each other mainly based on characters of fruit morphology and features of the leaves. The species are attributed accordingly and differences between them have been found in flowers and growth forms.