Polysphaeria

Polysphaeria is a genus of plants in the family Rubiaceae, and its native range is Madagascar and Tropical Africa. It contains the following 22 species according to Plants of the World Online:
 * Polysphaeria acuminata Verdc.
 * Polysphaeria aethiopica Verdc.
 * Polysphaeria arbuscula K.Schum.
 * Polysphaeria braunii K.Krause
 * Polysphaeria capuronii Verdc.
 * Polysphaeria cleistocalyx Verdc.
 * Polysphaeria dischistocalyx Brenan
 * Polysphaeria grandiflora Cavaco
 * Polysphaeria grandis (Baill.) Cavaco
 * Polysphaeria hirta Verdc.
 * Polysphaeria lanceolata Hiern
 * Polysphaeria lepidocarpa Verdc.
 * Polysphaeria macrantha Brenan
 * Polysphaeria macrophylla K.Schum.
 * Polysphaeria maxima (Baill.) Cavaco
 * Polysphaeria multiflora Hiern
 * Polysphaeria ntemii S.E.Dawson & Gereau
 * Polysphaeria ovata Cavaco
 * Polysphaeria parvifolia Hiern
 * Polysphaeria pedunculata K.Schum. ex De Wild.
 * Polysphaeria subnudifaux Verdc.
 * Polysphaeria tubulosa (Baill.) Cavaco