Response to density in a wild population of the perennial herb Salvia lyrata: variation among families.

Survival data gave no indication of variation among families in their responses to the range of environments. Different families were favored in different densities and locations, in support of the hypothesis that environment-dependent selection promotes specialization to different environments in this species. The correlation among families between leaf number in high and low density was small and positive, indicating near-independence of performance in different densities. -from Author