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Author: Mary Gunn Publisher: CRC Press ISBN: 9780869611296 Category : Science Languages : en Pages : 844
Book Description
This text gives biographical accounts of the leading plant collectors and their activities in Southern Africa from the days of the East India Company until modern times.
Author: Mary Gunn Publisher: CRC Press ISBN: 9780869611296 Category : Science Languages : en Pages : 844
Book Description
This text gives biographical accounts of the leading plant collectors and their activities in Southern Africa from the days of the East India Company until modern times.
Author: Neil R. Crouch Publisher: Penguin Random House South Africa ISBN: 1431701432 Category : Science Languages : en Pages : 779
Book Description
This comprehensive guide to the ferns of southern Africa (covering South Africa, Swaziland, Lesotho, Botswana and Namibia) throws new light on a fascinating category of plants that is little known by the general public . User-friendly and accessible, it will enable quick and sure identification of all 321 ferns known to occur in the region. Each species features a double-page spread with a full plate of photographs (including close-ups); informative line drawings where necessary; clear text descriptions; tables that highlight differences between similar-looking species; and distribution maps based on years of intensive fieldwork. In addition, there are identification keys to families, genera and species. To compile this book the authors travelled extensively and took some 30 000 photographs, even finding several new species of fern. They are all treated in this guide – some described here for the first time. This unique and beautiful volume will become the standard reference book on the ferns of southern Africa.
Author: Peter V. Bruyns Publisher: Springer Nature ISBN: 3030493997 Category : Science Languages : en Pages : 515
Book Description
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.
Author: Saul Dubow Publisher: Manchester University Press ISBN: 1526119781 Category : History Languages : en Pages : 252
Book Description
This collection, dealing with case studies drawn from South Africa, Zimbabwe, Mozambique and Mauritius, examines the relationship between scientific claims and practices, and the exercise of colonial power. It challenges conventional views that portray science as a detached mode of reasoning with the capacity to confer benefits in a more or less even-handed manner. That science has the potential to further the collective good is not fundamentally at issue, but science can also be seen as complicit in processes of colonial domination. Not only did science assist in bolstering aspects of colonial power and exploitation, it also possessed a significant ideological component: it offered a means of legitimating colonial authority by counter-poising Western rationality to native superstition and it served to enhance the self-image of colonial or settler elites in important respects. This innovative volume ranges broadly through topics such as statistics, medicine, eugenics, agriculture, entomology and botany.
Author: Umberto Quattrocchi Publisher: CRC Press ISBN: 1000897710 Category : Medical Languages : en Pages : 647
Book Description
This volume provides the origins and meanings of the names of genera and species of extant vascular plants, with the genera arranged alphabetically from R to Z.
Author: Mary Gunn
Author: Mary Gunn
Author: 
Author: Mary Gunn
Author: John Hutchinson
Author: Mary N. Harris
Author: Neil R. Crouch
Author: Peter V. Bruyns
Author: Hugh F. Glen
Author: Saul Dubow
Author: Umberto Quattrocchi