An annotated taxonomic conspectus of the genus Coffea (coffee) is presented, with 103 species and seven infraspecific taxa enumerated. The taxonomic history of Coffea is summarized and details of the circumscription of Coffeeae, Coffea , and the subgeneric groups of Coffea are given. For each accepted name, the author, place of publication, type species, and synonyms are given. Useful illustrations and literature are cited, where available. The distribution of each accepted taxon is summarized as a text note and using the Taxonomic Database Working Group (TDWG) system; the vegetation type and altitude are given in an ecological summary. A list of potentially new taxa is included. Two lectotypes are designated. Conservation assessments are given based on the World Conservation Union (IUCN) Red List Categories. Of the 103 Coffea species, 72 ( c . 70%) are threatened with extinction as a result of a combination of decline in quantity and quality of habitat.

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The taxonornic history of Psychotria asiatica L., the type species of the genus Psychotria L., is introduced and discussed in. detail. For the first time, the name I? asiaticu is unambiguously linked with wild populations of Psychotria from south-east China, allowing critical morphological characteristics and geographical distribution of Psychotria sensu stricto to be known. A full description of l? asiatica is given and representative herbarium specimens are cited. The importance and implications of identifying living representatives that match the type species of Psychotria are briefly discussed. One significant finding of this study is that P. asiatica has pyrenes with preformed germination slits (PGSs), the absence of which has been used by some workers to separate Psychotria from other members of the tribe Psychotrieae.

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