Introduction
Studies on sexual reproductive systems in angiosperms con-
tribute insights into of evolutionary processes and deepen the
understanding of their capacity to live in most diversified envi-
ronments. Autogamy, for example, is a system that allows the
persistence of plants in changing environments, since unlike for
allogamy, no pollinators are required for seed production of the
plants (Goodwillie et al., 2005). However, autogamy may result in
a reduced genetic variability (Schemske and Lande, 1985). Thus,
the balance between advantages and disadvantages of each sys-
tem for a given plant and under particular ecological circumstances
can stimulate a dynamic reproductive equilibrium, involving both
self- and cross-pollination. Plants with a mixed mating system
respond more effectively to environmental variations, improving