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This paper presents a taxonomic study of genus    Vincetoxicum    s.str. from southern Asia. Eleven regional endemic species are recognized on the basis of herbarium studies and fieldwork. Three new species are described:    V.   lenifolium    sp. nov.  (endemic to Pakistan),    V.   stewartianum    sp. nov.  (endemic to India), and    V.   subcanescens    sp. nov.  (endemic to Pakistan, Kashmir and Tibet). Three species names,    V.   cabulicum   ,    V.   glaucum    and    V.   kenouriense   , previously treated as synonyms of    V.   glaucum   ,    V.   canescens    and    V.   hirundinaria   , respectively, are resurrected. A neotype is designated for the Afghani endemic    V.   cabulicum   . A lectotype is chosen from the syntypes of    V.   glaucum   . We resolve the long-standing taxonomic problems in three species complexes:    V.   arnottianum   ,    V.   luridum   ,    V.   sakesarense   , and    V.   stocksii   ;    V.   glaucum   ,    V.   canescens    and    V.   cabulicum   ; and    V.   hirundinaria    and    V.   kenouriense   . Geo-taxonomic distinctions of southern Asian taxa are highlighted by excluding from henceforth the long misrecognized western Eurasian taxa    V.   canescens    and    V.   hirundinaria   . Furthermore, a detailed account of the genus including illustrations of whole plants, leaves and corona, distribution maps, a taxonomic key, morphological descriptions, synonymy, notes, and information on phenology, distribution and habitats is provided. Finally, provisional conservation assessments are provided, which indicate that    V.   cardiostephanum    and    V.   sakesarense    are critically endangered.

Taxonomy of Vincetoxicum s.str. ( Asclepiadoideae , Apocynaceae ) from southern Asia including three new species and resurrected names