This book is the story of the search to discover the biological basis of seed behavior in the weedy Setaria species-group. It consists of seven chapters, five experimental, a concluding essay and an introduction. The first two are from studies by Milt Haar. In the first, stable and plastic seed productivity behaviors are studied in terms of plant architecture. In the second, the structure of seed dormancy (seed heteroblasty) is elucidated. In the next three by Kari Jovaag (based on field experimental work by Brad Atchison), seed heteroblasty defines the evolutionary ecological role this...