The genus has recently been revised (Sands 1999), several new species having been found in rain forest in southern Cameroon and southern Congo (Brazzavile). It is common and relatively speciose in the soils of the Congo forest block.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
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