Individual variation in total plant reproduction was studied in experimental populations of Phlox drummondii and Brassica rapa. Variation was studied with respect to differences in area available to each plant for growth, distance to nearest neighbor, average plant density, and emergence date. The results showed significant inequality in reproductive performance between individuals. Date of emergence was clearly a significant factor when this was variable. Among even-aged plants, available area and distance to nearest neighbor accounted for some differences. In establishing a reproductive hierarchy, earlier germination has a very large influence.

Key words: reproductive ecology, reproductive inequality