Floral traits of visited flowers were correlated with seed set produced by pollinators to detect selection on any particular trait. Because diverse visitors pollinating the flowers may have exerted different selective pressures on the floral traits, morphological vari- ability in the above floral measurements was compared with that of Venezuelan Pilosocereus moritzianus (Otto) Byles and Rowley and P. lanuginosus (L.) Byles and Rowley, both of which are pollinated almost exclusively by glossophagine bats