Moller, A. P., and M. Eriksson. 1995. Pollinator preference for symmetrical
flowers and sexual selection in plants. Oikos 73:15-22.   This paper has
some evidence that flower visitors can detect differences in flower size
within a species, and that they prefer the larger ones.
 
Dr. David W. Inouye
Dept. of Zoology, University of Maryland, College Park, MD 20742
E-mail: [log in to unmask]   Phone:  301-405-6946     FAX: 301-314-9358
http://www.inform.umd.edu/EdRes/Colleges/LFSC/.FacultyStaff/dinouye