Daily display size of male (blue triangle) and female flowers (red circle) of <i>S. trifolia</i> and <i>S. graminea</i> using representative examples from population of four different sizes (a) 2, (b) 4, (c) 10 and (d) 20, respectively.

<p>Daily display size of male (blue triangle) and female flowers (red circle) of <i>S. trifolia</i> and <i>S. graminea</i> using representative examples from population of four different sizes (a) 2, (b) 4, (c) 10 and (d) 20, respectively.