Hooker, Joseph Dalton. 1863a. Enumeration of the mountain flowering plants and ferns collected by M. Gustav Mann, government botanist, during his various ascents of the Camaroons Mountains, of Clarence Peak, Fernando Po, and of the peak of San Thomé. Appendix 3 in Abeokuta and the Camaroons Mountains. An exploration, by Richard F. Burton. 2 vols. London.
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