Preliminary revision of the genus Sopubia (Scrophulariaceae) in Madagascar

The Malagasy taxa of the genus Sopubia Buch.-Ham. ex D. Don are revised, including a discussion of the type species, S. trifida, a subspecies of which inhabits Madagascar. Two new species are described, S. lemuriana and S. gracilis, and one new synonym is mentioned. A key to the species is provided, along with descriptions, illustrations, and data on their distribution.