(Uploaded by Plazi for the Bat Literature Project) In angiospermsselectionhas led to the utilizationof numeroussubstancesotherthanpollenand nectar that help to insure repeatedvisitation by pollinatinganimals. Here, we group the various substancesinto nonnutritiveand nutritiverewardsand discuss withineach groupthe specifickinds that occur. In our discussionof nutritiverewards,we emphasizefloraloils, lipidsproducedby one of two types of specializedsecretoryorganscalledelaiophoresand which serve as nutritiverewards for certain New Worldanthophorinebees. Althoughdiscovered only withinthe last 15 years, the syndromeof oil productionnow appearsto be one of the most widespreadkindsof floralrewards. We reportherefor the firsttime the occurrenceof oil productionin the Solanaceae(Nierembergia). It is apparentthat oil productionhas evolved independentlymany times, but plantswhich produce oils that are collectedby femaleanthophorinebees show similaritiesin the chemistryof the oils and the types of structuresthatproducethem. It is not clear whetherothergroupsof plantsreportedto produceoils but whichare not pollinatedby anthophorinebees possess an analogoussystem or not.