Ceropegia changjiangensis (Apocynaceae), a new karst-obligate species from Hainan, China

Ceropegia changjiangensis, a new species of the family Apocynaceae from Hainan, China, is described and illustrated. It is most similar to C. dolichophylla and C. thaithongiae, but can be easily distinguished from them by leaf and flower features, be it leaf blade surface and apex, corolla lobes, corolla tube and outer corolla lobes.