The effect of paternity on the likelihood of fruit production was determined by making 2,486 hand pollinations among 11 stems (9 individuals) of Campsis radicans. All individuals matured significantly different numbers of fruit from different pollen donors. Individuals that were favored as donors by one recipient were not necessarily those favored by other recipients. Selectivity increased slightly as more pollinations were made, and pollination by nonfavored donors was more successful in producing fruit during the first half of the pollination sequence than in the latter half. The pollen donors favored by particular recipients were usually those whose pollinations resulted in fruit with relatively many and large seeds. Fruit abortion seems to have been more important in donor selectivity than prezygotic phenomena, although parallels with multifactorial gametophytic incompatibility are evident. I suggest this selectivity by a pollen recipient with respect to pollen donors is an integrated response increas...