Genus Marsdenia R. Br. (Asclepiadaceae)ca. 100 spp. distributed in the tropical regions in America, Africa and Asia. 22 spp. are distributed in China while only 1 species, Marsdenia lachnostoma, is found in Hong Kong. Marsdenia are mostly climbers where shrubs or subshrubs are rare.
Marsdenia lachnostoma is a rare species in China and Hong Kong. Its range is so narrow that it is only distributed in Hong Kong within China (It is also found in Cambodia, Laos and Tailand). Because of this, it is listed in the rare and precious plants of Hong Kong and catergorized as critically endangered in the China Red Plant Data Book. Furthermore, it is still not a common species in Hong Kong while it can only be found in a few localities such as Ma On Shan, Tung Lung Chau and High Junk Peak.
The common name of M. lachnostoma is called Hairy-throat Condorvine. It is because the throat of its flowers is covered by a very dense tuft of woolly hairs.
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