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This book presents a new account of Euphorbia in southern Africa. Euphorbia is the second largest genus of plants in the world. Southern Africa enjoys a high diversity in Euphorbia and 170 species occur here naturally. Of these 170 species, 128 or 74% are endemic. Where most species of Euphorbia in the northern hemisphere are herbs or shrubs, most of those in southern African are succulent. These succulents range from small, almost geophytic forms where the tuber is larger than the above-ground parts to huge trees 6 to 15 m or more in height. Many of them are spiny. There are also small numbers of herbaceous species in southern Africa and many of these are also dealt with here. The last account of the succulent species for southern Africa was published in 1941 and much new data has accumulated since then. Our understanding of the relationships of the species in Euphorbia has also been greatly enhanced by recent analyses of DNA-data, which led to new and unexpected results. From this new information an entirely new classification was developed, in which Euphorbiawas divided into four subgenera. This provides the taxonomic framework for the presentation of our species here. Around ten new species have been described and these are presented in detail for the first time. This monograph is made up of two volumes. Volume 1 contains an extensive introductory chapter with an overview of the genus in the region, emphasizing many of its important and distinctive features. This is followed by Chapter 2, which deals with subgenus Athymalus. Of the four subgenera, this one is by far the most diverse in southern Africa, with 80 species. Volume 2 contains Chapters 3 (subg. Chamaesyce, 34 species), 4 (subg. Esula, 11 species) and 5 (subg. Euphorbia, 45 species), as well as an additional Chapter 6 covering the remarkable diversity of subg. Euphorbia in Moçambique. Each of Chapters 2 to 5 includes a key to all the species, followed by an account of each of them. This account includes synonymy, a description, data on distribution and habitat, line-drawings of floral features and other diagnostic details, notes on how the species is distinguished from its closest relatives and a brief history of its discovery. Several colour photographs are included for each species, illustrating its habitat, vegetative habit and flowering features, demonstrating key points distinguishing it from others and often showing its variability. Euphorbia is an important component of the vegetation in many of the drier parts of southern Africa. This book is based on a thorough evaluation of the vast herbarium record for southern African members of Euphorbia, on the extensive field-work conducted in the region and the wide taxonomic experience of the author. It is believed that both the professional botanist and the layman will find much that is new and informative in this monograph.

General ecology and biosociology --- Plant physiology. Plant biophysics --- plantenfysiologie --- biodiversiteit --- Plants --- Biodiversity. --- Plant Evolution. --- Plant Development. --- Evolution. --- Development.

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This volume is a monograph of the genus Diplusodon (Lythraceae), written by the world authority on this plant group. Diplusodon is a monophyletic genus of shrubs and subshrubs, with showy, 6-merous, actinomorphic flowers, and floral tubes on which the sepals alternate with conspicuous epicalyx segments. The capsular fruit contains winged seeds and, uniquely for the family, is divided by a bipartite placenta with two semi-lunate septa. Diplusodon is the second largest genus in the Lythraceae and occurs mostly in the Cerrado Biome, the floristically diverse savannah that covers more than two million km2 of the Central Brazilian Plateau, extending west into Bolivia, south to Paraguay and east to the Caatinga. A total of 104 species and eight varieties are recognized in the genus, for which 46 lectotypes, one neotype, one new status and one new combination are designated, nine new species are described, and 15 taxa are placed in synonymy. New information on floral and vegetative morphology, pollen, cytology, chemistry, floral biology, and habitat are provided for the genus. In addition, keys to the species are accompanied by descriptions, illustrations, distribution maps, and assignment of conservation status.

General ecology and biosociology --- Plant physiology. Plant biophysics --- Botany --- Biotechnology --- plantenziekten --- systematische plantkunde --- plantenfysiologie --- biodiversiteit --- biotechnologie --- Plants --- Plant diseases. --- Plant biotechnology. --- Plant ecology. --- Biodiversity. --- Plant Development. --- Plant Evolution. --- Plant Pathology. --- Plant Biotechnology. --- Plant Ecology. --- Development. --- Evolution. --- Litràcies --- Botànica

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This book provides a comprehensive monograph of the family Humiraceae. It includes information on economic botany, conservation, phylogenetic relationships, taxonomic history, ecology, cytology, anatomy, and phytochemistry, among other topics. This volume is illustrated with line drawings, black and white photographs, and distribution maps. It was written by the world-leading authority on this plant group and contains a total of eight genera, 65 species, and 15 infraspecific taxa, with two new species described. This work is volume 123 in the Flora Neotropica book series (Lawrence M. Kelly, Editor-in-Chief). Flora Neotropica volumes provide taxonomic treatments of plant groups or families growing in the Americas between the Tropic of Cancer and the Tropic of Capricorn.

General ecology and biosociology --- Plant physiology. Plant biophysics --- Phytomorphology. Phytoanatomy --- Botany --- plantenziekten --- systematische plantkunde --- plantenfysiologie --- biodiversiteit --- planten --- Plant anatomy. --- Plants --- Plant diseases. --- Plant ecology. --- Biodiversity. --- Plant Anatomy and Morphology. --- Plant Development. --- Plant Evolution. --- Plant Pathology. --- Plant Ecology. --- Development. --- Evolution. --- Espècies (Biologia)