Abstract
The genus Rosa (Rosaceae) is a remarkable genus with respect to systematic biology. Multiple reproductive strategies ranging from apomixis to outcrossing including hybridisation, as well as different modes of character inheritance like matroclinal, paternal or sex unrelated ones. This complexity makes the genus a model in which simple concepts of radiation, speciation and taxonomy come to their limits. Analyses of the evolutionary patterns and processes in Rosa give clear evidence for the stochastic character of this specific evolutionary scenario.
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