SEDE HYPOTHESIS. “Regardless of whether or not reversals to outcrossing occur, even rarely, the unidirectional evolution of selfing lies at the philosophical heart of Stebbins’ characterization of selfing lineages as evolutionary ‘blind alleys’, contextually interpreted as inescapable entrapments that prevent the elaboration of radically new adaptive devices.”
http://onlinelibrary.wiley.com/doi/10.1111/nph.12182/full