Phylogenetic analysis of rbcL and atpB gene sequences from Biebersteinia Stephan (represented by B. orphanidis Boiss.) and from selected taxa of the rosids I and I1 clades does not support traditional grouping of this genus in Geraniaceae S.S. nor in Geraniales, but indicates strong support for a position nested within Sapindales (as recently delimitated). The rbcL and atpB phylogenies obtained were congruent but differently resolved and do not link Biebershnia to any other clade within Sapindales. Biebersteinia is on a long branch on its own which, given the particular combination of apomorphic morphological characters, justifies familial status.
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Bakker et al. (1998) studied this question.
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