Two new species of Myrsinaceae from French Guiana

Herbarium studies leading to a treatment of the Myrsinaceae for the Flora o f Central French Guiana resulted in the discovery of two heretofore undescr ibed species, Cybianthus prevostiae and Stylogyne incognita. The species ar e described and illustrated, and hypotheses regarding phylogenetic relation ships with their respective congeners are provided. Cybianthus prevostiae i s unusual among members of Cybianthus subgen. Weigeltia owing to its monoax ial habit and ellipsoid pistil, and deeply cupuliform calyx. Stylogyne inco gnita, a taxon often confused with S. micrantha, is most closely related to S. sordida but is separated from it by the corymbose inflorescence, entire leaves, longer petioles, and membranaceous perianth.