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The systematics of    Tryssophyton   , herbs endemic to the Pakaraima Mountains of western Guyana, is reviewed and    Tryssophyton   quadrifolius    K.Wurdack &amp; Michelang.,  sp. nov.  from the summit of Kamakusa Mountain is described as the second species in the genus. The new species is distinguished from its closest relative,    Tryssophyton   merumense   , by striking vegetative differences, including number of leaves per stem and leaf architecture. A phylogenetic analysis of sequence data from three plastid loci and   Melastomataceae  -wide taxon sampling is presented. The two species of    Tryssophyton    are recovered as monophyletic and associated with mostly Old World tribe Sonerileae. Fruit, seed and leaf morphology are described for the first time, biogeography is discussed and both species are illustrated.

Systematics and relationships of Tryssophyton ( Melastomataceae ), with a second species from the Pakaraima Mountains of Guyana