Floral scents attract pollinators, and a varied repertoire of floral scents has been documented among plant species. Delle-Vedove et al. survey the results of 81 studies investigating intraspecific variation of floral scents in 132 taxa.
Variation was classified according to identity, proportion or absolute quantities of Volatile Organic Compounds, as well as data with the potential to explain variation, such as methodology, plant origin or pollination biology. Variation was evident in almost all investigated species, both among individuals (among and sometimes within populations) and within individuals across different temporal scales. This review article suggests that floral scent variation can be mediated by temporal shifts in pollinator identity and behaviour among populations, deceit pollination and sex-specific selection, and also by natural enemies, genetic drift, gene migration and other constraints.