The number of families in each of the six major groups of angiosperms: ANITA grade, Magnoliids, monocots + Commelinids, eudicots + core eudicots–Asterids–Rosids, Asterids and Rosids, with different classifications of self-sterility. (A) Number of families in each phylogenetic group classified by their SS/SC status including unclassified families across all 445 families of angiosperms recognized by APG II (Stevens, 2010 onwards). (B) Number of families in each phylogenetic group classified by their SI phenotype for the 78 families for which the SI phenotype data are available. (C) Number of families across each phylogenetic group exhibiting different forms of genetic control of SI for the 27 families for which data are available.