Fig. 5

Association between degree of pollinator dependence and pollinator visitation rates. Mean (± SE) visitation rates (number of visits per hour) of Convolvulaceae study species in Nong Khai, Thailand categorized by degree of pollinator dependence (and how much xenogamous pollen is received). Categories with different letters have significantly different pollinator visitation rates (Tukey’s post-hoc, P < 0.01). Sample sizes (n) indicate the number of Convolvulaceae species classified in each category. [Note: Ipomoea pileata could not be definitively categorized and was therefore excluded.]