Fig. 1.

Values of long and short stamen exsertion in experimental populations of wild radish. Points represent mean values across flowers for each plant used in the field pollination experiment. Exsertion was measured as the difference between filament length and tube length, hence, negative values indicate insertion of the bottom of the anther into the corolla tube. Because the anthers are 2 mm long on average, an exsertion of –2 means that the top of the anther is even with the tube opening, and values above this mean at least part of the anther is exserted. (A) Exsertion selection experiment (n = 72); plants were selected either to increase exsertion (‘High’) or to decrease exsertion (‘Low’). (B) Dimorphism selection experiment (n = 80); plants were selected for decreased dimorphism (‘Low’).