Plant breeding systems and the factors that regulate sexual systems in natural plant populations may influence the frequency and quality of reproductive events (Richards1997). Data on there productive biology and breeding systems are very important to establish effective management and recovery programs for rare and endanged plant species (LiuandKoptur,2003, Kwakand Bekker 2006), by helping identify the actual factors threatening the persistence of endangered plant populations(Kwakand Bekker 2006).National Science Foundation, HRD #0734826 University of Puerto Rico, Central Administration and Río Piedras Campus