Taxonomic Relationships and Status of the Genus Dorystephania (Asclepiadaceae: Marsdenieae) from the Phillipines and Borneo

Abstract

The taxonomic history and relationships of the genus Dorystephania Warb. (Asclepiadaceae) with two species from Bomeo and the Philippines respectively, are reviewed. It is concluded that Dorystephania belongs in the Marsdenieae and is congeneric with Sarcolobus R. Br. The new combinations Sarcolobus luzonensis (D. luzonensis Warb.) and S. borneensis (D. borneensis Steen.) are made. Both species are described in detail and S. borneensis is lectotypified. Regional keys to Sarcolobus in the Philippines and Borneo are provided.