G.E. Wickens – författare

Economic plants have been defined by SEPASAT as those plants that are utilised either directly or indirectly for the benefit of Man. Indirect usage includes the needs of Man's livestock and the maintenance of the environment; the benefits may be domestic, commercial or aesthetic. Economic plants constitute a large and so far uncalculated percentage of the quarter of a million higher plants in the World today. However, it has been calculated that 10% (25 000) of these species are now on the verge of extinction and extinction means that a genetic resource that could be of benefit to Man will be lost for ever. Furthermore, for every species lost an estimated 10-30 other dependent organisms are also doomed. Fewer than 1 per cent of the World's plants have been sufficiently well studied for a true evaluation of the potential floral wealth awaiting discovery, not only in the rain forests, which man is now actively destroying at a rate of 20 ha a minute, but also in the very much neglected dry areas of the World.

Since plants not only provide food for man and his domestic animals but also pharmaceutical products and raw materials for industry, the development of new crops is of great importance. However, many plant species remain unexploited or are only utilized at a local level. This book provides information on the current research into the use of such crops and on their development in a commercial setting. Written by scientists from many different countries, it covers a wide variety of both temperate and tropical crops, their cultivation, marketing and development, and the socio-economic and environmental factors influencing their utilization.

Unlike most books on economic botany this is not an encyclopaedic listing of plants and their uses. Instead it is an attempt at understanding why plants are used. Economic botany is a multidisciplinary study and the purpose of this book is to provide an introduction to some of the scientific principles, processes, and practices involved. The subjects discussed include the role of economic and ethnobotany, plant collecting, taxonomy and nomenclature, the environment and the physiological, morphological and anatomical adaptations of the plant, plant conservation, plant breeding and propagation, the marketing of crops and crop products, basic human and animal nutrition, human and animal foods, desirable insect foods, timber and wood products, fuel, fibres, biochemicals, human and veterinary medicine, plant toxins, lower plants and their products, the role of plants in ameliorating the environment, and the social uses of plants. It is hoped that this book will appeal to both the student and practitioner, irrespective of their primary discipline.

The strength of this book is that it is written by someone who has spent a lifetime devoted to the science of economic botany. The author has brought together his vast experience in the field in Africa with his studies of arid land plants at the Royal Botanic Gardens, Kew. The result is an informative and reliable text that covers a vast range of topics. It is also firmly based upon the author's research and interest in plant taxonomy and therefore fully acknowledges the importance of correct naming and classification in the field of science of economic botany. The coverage is of economic botany in its broadest sense. I was delighted to find such topics as ecophysiology, plant breeding, the environment and conservation are included in the text. This gives the book a much more comprehensive coverage than most other texts on the subject. I was also glad to see that the book covers the use of various organisms that are no longer considered part of the plant kingdom such as various species of fungi and algae. It is indeed a broad ranging book that will be of use to many people interested in the uses of plants and fungi. Economic botany is once again being given more prominence as a discipline because of its enormous relevance to both conservation and sustainable development. Those people involved in those topics shOUld find this a most useful resource.

Although Alexander von Humboldt never saw a baobab, he wrote: ‘Among organic creatures, this tree [Dracaena draco (dragon tree)] is undoubtedly, together with the Adansonia or baobab of Senegal, one of the oldest inhabitants of our planet’ (Humboldt 1852). With their enormous size, distinctive and often grotesque appearance, and great age (measured perhaps in thousands of years), baobab trees attract the attention of botanists, amateurs, tourists and passers-by wherever they grow. Old specimens display highly individual, photogenic characteristics which endear them to local people, artists and photographers. European knowledge of the African baobab dates back to Renaissance times. I first became acquainted with the African baobab in 1952 while working in what was then Sokoto Province, Northern Nigeria. Later I worked in the former Rhodesias (now Zambia and Zimbabwe) and in the Sudan, and was able to further my studies. Although I have written about the African baobab, it was Pat Lowe who, in January 2000, persuaded me that we should pool our knowledge and ex- riences and write a book on all eight species of this outstanding genus. While I take full responsibility for the final text, I have taken advantage of her knowledge of baobabs in Africa, Madagascar and especially Australia, and of her constructive criticism of the text.