A checklist of the Rubiaceae (coffee family) of Bioko and Annobon (Equatorial Guinea, Gulf of Guinea)

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Abstract
A detailed checklist of the Rubiaceae (coffee family) occurring naturally on the islands of Bioko and Annobon (Equatorial Guinea, Gulf of Guinea) is presented, based on herbarium collections deposited in the herbaria of the Royal Botanic Gardens, Kew and The Natural History Museum, London. The checklist comprises 58 genera and 147 species, including six new generic records and 26 new infrageneric records. The total number of native Rubiaceae species occurring in Bioko is 139; three entities do not have formal names and probably represent new taxa. In Annobon there are 12 native genera and 13 indigenous species of Rubiaceae. The conservation status of two endemic species is assessed using IUCN criteria and it is proposed that they are considered Vulnerable.