''Vincetoxicum hainanense'' is a species of plants in the

Apocynaceae Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of the ...

. It was first described in 1941 as ''Merrillanthus hainanensis'', which was the only species in the genus ''Merrillanthus''. It is native to

Guangdong Guangdong (, ), alternatively romanized as Canton or Kwangtung, is a coastal province in South China on the north shore of the South China Sea. The capital of the province is Guangzhou. With a population of 126.01 million (as of 2020) ...

Hainan Hainan (, ; ) is the smallest and southernmost province of the People's Republic of China (PRC), consisting of various islands in the South China Sea. , the largest and most populous island in China,The island of Taiwan, which is slightly l ...

, and

Cambodia Cambodia (; also Kampuchea ; km, កម្ពុជា, UNGEGN: ), officially the Kingdom of Cambodia, is a country located in the southern portion of the Indochinese Peninsula in Southeast Asia, spanning an area of , bordered by Thailand t ...

Flora 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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References

{{Taxonbar, from1=Q89275308, from2=Q15613560, from3=Q9031808 Flora of China Flora of Cambodia hainanense