Number of flowers visited versus inflorescence size and stem size for each visitor taxon. A and D, Apis mellifera (circles); B and E, Bombus spp. (triangles); C and F, lepidopterans (crosses). Inflorescence size is the number of open flowers on the visited inflorescence, and stem size is the total number of open flowers on the visited stem. We estimated the coefficients (β) using a negative-binomial generalized log-linear model, and we calculated χ2s and Ps using likelihood ratio tests to determine if βs were significantly different from zero.