Hoya tamdaoensis (Apocynaceae, Asclepiadoideae), a new species from Vietnam

Abstract

A new species of Hoya R.Br. from Tam Đảo National Park (Vĩnh Phúc Province, Vietnam), Hoya tamdaoensis Rodda & TB.Tran, is described and illustrated. It is distinguished from the morphologically similar Hoya siamica Craib by corolla size, lamina shape, coloration, and orientation of the petioles.