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(A) Relationship between species mean flower size (–PC1) vs. species mean selfing rates (sm) in Collinsia (y = –0·0003x – 0·44; R2 = 0·18). (B) Relationship between species mean stage of stigmatic receptivity vs. species mean selfing rates (sm) in Collinsia (y = –0·11x – 0·25; R2 = 0·34). Species fall into two distinct groups based on stage of stigmatic receptivity <1·5 or stage of stigmatic receptivity >2·8. See text for details.
