Figure 4.

The diversity of sexual systems that can potentially occur in a species with three sex phenotypes: hermaphrodite, female and male. (a) Location of the five sexual systems resulting from plotting population sex ratios into a triangle of sex phenotype space. (b) The observed pattern of sex-ratio variation in a sample of 116 populations of the clonal aquatic Sagittaria latifolia from the northern portion of its range in eastern N. America. Each black dot represents a single population and is located on the triangle based on the frequencies of sex phenotypes within each population. Dots within the triangle are populations that contain all three phenotypes, populations with two sex phenotypes are on the axes, and populations containing a single sex phenotype are located on the apices of the triangle. Sampling of flowering ramets in each population followed methods detailed in Dorken & Barrett (2004b). Unpublished data of S. B. Yakimowsi & S. C. H. Barrett (2009).