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My students and I try to determine (1) how natural selection shapes plant reproduction, life history, and physiology, and (2) why species range edges occur where they do. We apply a diverse and integrative approach that includes studies of resource-allocation, genetics, natural selection in the wild, geographic distribution and geographic variation, pollination biology, experimental population biology, and physiological ecology.

Clarkia xantiana -- breeding systems, life history, color polymorphism, geographic range edges	Linum rigidum -- Iowa plant and animal ecology	Phacelia linearis -- plant sexual systems