Abstract

The new species Hoya rostellata Kidyoo (Apocynaceae: Asclepiadoideae) is described and illustrated. This plant is distributed in the western and northern parts of Thailand, usually grows on limestone rock and climbs up on tree in the forest edge. It is distinguished from the closest relative, H. siamica Kerr by leaf shape, leaf base, leaf apex, presence of vein and habitats.

Keyword: Apocynaceae, Asclepiadoideae, Hoya rostellata, limestone rock, new species, Thailand