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The main body of the book is the compilation of conservation summaries for the 7388 tree species which have been evaluated as globally threatened. The summaries are arranged alphabetically by genus. In order to reduce the size of the species accounts, scientific authorities for species names and common names are not given although these are recorded in the Tree Conservation Database. The threatened tree species included are those which have been evaluated as Critically Endangered, Endangered and Vulnerable. Species which have been evaluated as Lower Risk: near threatened and Lower Risk: conservation dependent are also included because, in most cases, the supporting information suggests that these trees are of equal conservation concern to species in the Vulnerable category. Furthermore summaries are also included for species evaluated as Data Deficient where it is apparent that the species are in a precarious situation even though some verification is needed of the taxonomic status or further field investigation is desirable. Frequently these species have been referred to as threatened elsewhere in the literature.
For each species the following information is given:
Botanical family name The standard followed for family and generic names is Vascular Plant Families and Genera (Brummitt, 1992).
lUCN Red List category and criteria.
Distribution The complete geographical distribution of species is recorded, as far as is known. Biological Recording Units are generally given, following World Geographical Scheme for Recording Plant Distributions. Plant Taxonomic Database Standards No. 2. (Hollis, Brummitt, 1992). The only changes from this standard are for the Provinces of South Africa, Eritrea and the Democratic Republic of Congo (the former Zaire).
Conservation summary This is based primarily on information provided by experts in the standard data collection forms, or from literature sources. In some cases the summary has been prepared by the expert who has evaluated the species and in other cases by the compilers at WCMC. Words which are preceded by an asterisk are further defined in the glossary.
Assessor This is either the expert whom, or organisation or regional workshop which, has assigned the lUCN category and criteria.
References The references relate either to botanical literature linked to the taxonomy, nomenclature and distribution of the species or to the source of conservation information including the conservation assessment