Even though the carpenter bee was the sole pollinator of this “chiropterophilous” cactus during our study, we do not characterize the pollination system of P. royenii as either specialized or generalized because it may be simply a species in transition. If Hurricane Georges caused a decrease in the M. redmani population and if the bat recovers to become an effective pollinator of P. royenii, then the system may once again be functionally chiropterophilous. Selection regimes may then change and variation in floral characteristics may shift as has been demonstrated in other natural systems.