Vincetoxicum hainanense is a species of plants in the Apocynaceae. It was first described in 1941 as Merrillanthus hainanensis, which was the only species in the genus Merrillanthus.Chun, Woon Young & Tsiang, Ying. 1941. Sunyatsenia 6: 105–108, pl. 17–18.Tropicos, genus Merrillanthus
It is native to Guangdong, Hainan, and CambodiaFlora of China Vol. 16 Page 252 驼峰藤属 tuo feng teng shu Merrillanthus Chun & Tsiang, Sunyatsenia. 6: 105. 1941.
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