Preface -- Introduction Herbert Baker: A Renaissance Botanist -- Evolutionary Dynamics -- Plastids in a Changing Environment -- Adaptive Shifts Toward Hummingbird Pollination -- Early Maturity, Small Flowers and Autogamy: A Developmental Connection? -- Chromosome Variation and Evolution in American and Asian Trillium Species -- Polyploid Polymorphism in Grasses of the North American Prairie -- The Genetic Structure of Tropical Tree Populations: Associations with Reproductive Biology -- Breeding Systems -- The Evolutionary Breakdown of Heterostyly -- Facultative Xenogamy: Examination of a Mixed Mating System -- BakerβS Law: Plant Breeding Systems and Island Colonization -- Reproductive Biology -- Pollenkitt in Plant Reproduction -- Reproductive Biology of Hibiscus Moscheutos (Malvaceae) -- Relationships between Components of Plant form and Seed Output in Collinsonia Verticillata (Lamiaceae) -- Size Dependent Reproduction in Poa Annua and P. Pratensis -- Yearly Fluctuations in a Vernal Pool Annual, Sidalcea Hirsuta -- Plant-Animal Interactions -- Floral Herbivory and the Apiaceae: Antagonistic or Mutualistic Interactions? -- Is Extrafloral Nectar Production an Inducible Defense? -- Leaf Domatia and Mites: A Plant Protection-Mutualism Hypothesis -- Evolution and Organization in Communities -- Response of Abies to Fire and Phellinus -- Interactions between Genetic and Ecological Patchiness in Forest Trees and their Dependent Species -- Dynamics of Plants in Buffalo Wallows: Ephemeral Pools in the Great Plains -- Evolution in Cultivated Plants -- Maize, Man and Vegetation in North-Central Peru -- Latitudinal Variation and Evolution in Wild Soybean (Glycine Soja Sieb. & Zucc.) Populations -- Reproductive Biology and Evolution of the Cultivated Chayote Sechium Edule: Cucurbitaceae -- Biogeography and Conservation -- Ecological and Behavioral Aspects of Seasonal Diphenism in Eurema Daira (Pieridae, Lepidoptera) -- Ecological and Evolutionary Sorting of 12 Sympatric Species of Centris Bees in Costa Rican Dry Forest -- Ecology and Evolution in the Great Plains -- Affirmative Action for Insects in Tropical National Parks