Four new submontane species of Psychotria ( Rubiaceae) with bacterial nodules from Western Cameroon.

Four new Psychotria species with conspicuous bacterial nodules in their leaf-blades, P. njumei Cheek, P. ngollengollei Cheek , P. darwiniana Cheek and P. babatwoensis Cheek are described, mapped and illustrated from the submontane forests of the Cameroon Highlands. Their taxonomic and conservation status are assessed. [ABSTRACT FROM AUTHOR]