A historical record of **Polysphaeria macrophylla** (African Rubiaceae, Octotropideae) from Bioko: with a neotypification of the species
Faculty of Sciences. Biology
Systematics and geography of plants / Jardin botanique national de Belgique. - Meise, 1999 - 2009
, p. 193-198
University of Antwerp
The genus Polysphaeria was only in 2007 recorded for the Gulf of Guinea Islands. A specimen collected on Bioko (Fernando Po) by Mildbraed in 1911 remained unnamed in the Rubiaceae until 1967 when it was erroneously filed under Coffea. It is in fact Polysphaeria macrophylla K.Schum., also known from the African mainland (Liberia to Cameroon). Polysphaeria macrophylla is easily distinguished from all other species of the genus by the presence of swollen internodes inhabited by ants, an apparent feature overlooked in the past. The species is neotypified and illustrated, and a key to the Guineo-Congolian species of the genus is provided.