Hoya hainanensis Merrill.

Shrubs epiphytic, glabrous except for corolla. Stems climbing to 2 m. Petiole 1-1.2 cm; leaf blade ovate-elliptic, 6-8 × 2.5-4 cm, papery, base acute, apex acuminate; lateral veins ca. 4 pairs, slender, obliquely ascending, arcuate, anastomosing. Pseudumbels extra-axillary, many flowered; peduncle ca. 2 cm. Pedicel slender, ca. 2 cm. Sepals acute. Corolla cream or pale yellow, 8-10 mm in diam.; lobes ovate-oblong. Corona lobes stellate spreading, outer angle subacute, inner angle produced into a sharp tooth incumbent on anther. Anthers lower than outer lobes, membranous tip rounded. Stigma head short apiculate. Fl. May. 2n = 22.

Mixed woods along riversides. Hainan [India, Sri Lanka].