Nature Conservancy, US

This represents the most comprehensive compilation of data on threatened vascular plants ever published. It includes the names of some 33,000 plant species determined to be rare or threatened on a global scale. Conservation assessments were provided by the IUCN Species Survival Commission, the National Botanical Institute (South Africa), Environment Australia and CSIRO,.

The "1994 Red List of Threatened Animals" was a major advance on its predecessors in clarity of layout and amount of information presented. This is taken further in the 1996 edition, which is also the first global compilation to use the complete new IUCN red list category system. Also for the first time, all mammal species have been assessed. This group and the birds are the only taxonomic classes where a comprehensive evaluation has been made.