Abstract

A new species of Dioscorea, D. namorckensis, from the Reserve Naturelle Integrale de Tsingy de Namoroka in Western Madagascar is described and illustrated, and its macromorphology and pollen morphology are presented. It is closely related to D. soso Jum. & H. Perr., and belongs in Dioscorea sect. Brachyandra Uline. It is found in the understorey and margins of deciduous forest on karst limestone, and appears to be endemic to Namoroka.

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