This book presents current research on all types of ant-plant interactions, and concentrates on understanding these often complex relationships in evolutionary and ecological terms. The range of interactions varies from herbivory (leaf-cutter ants) to complex symbiosis. Many ants prey on plant pests, thus protecting the plant from harm, receiving in exchange nectar and/or nest sites. In some cases the ants tend and protect other insects such as butterfly larvae or Homopterans (which include the aphids and cicadas) which may benefit the ants at the expense of both the host plant and the other insects. Some ants are known to be seed dispersers, and in at least one plant (cocoa) they appear to affect rates of pollination. A significant proportion of these interactions exhibit a high degree of mutualism, making this book part of a growing literature on the ecological determinants of mutualistic behaviour. The thirty-seven chapters by more than fifty contributors range in geographical coverage from northern and southern temperate zones, to the New World tropics, to Australia and south-east Asia. The emphasis throughout, even in the more descriptive chapters, is on possible explanations for observed phenomena. Workers in ecology, evolution, and behaviour will welcome this compendium of information on a subject that has become a modern testing-ground for evolutionary ecology.

For many years orchids have been among the most popular of ornamental plants, with thousands of species and hybrids cultivated worldwide for the diversity, beauty, and intricacy of their flowers. This book is the eagerly-awaited result of over 30 years of research into orchid anatomy by one of the world's leading authorities and is the first comprehensive publication on orchid anatomy since 1930. It describes the structure and relationships among the cells and tissues of leaves, stems, and roots, and is organized systematically in line with the taxonomy expressed in the OUP Genera Orchidacearum Series. The book is fully illustrated with over 100 photomicrographs and numerous original line drawings. This latest addition to the Anatomy of the Monocotyledons Series is an essential reference text for orchid scientists and research students and will also be of interest and use to a broader audience of orchid enthusiasts.

The collected papers presented at the Frank White Memorial Symposium held at Oxford in 1996. Two papers are on Frank White's life and work, with a further 15 on aspects of plant and animal geography, taxonomy and ecology in Africa.