Marsdenia is a genus of twining lianas and climbing shrubs in the family Apocynaceae (order Gentianales), formally described by the Scottish botanist Robert Brown in 1810. The genus belongs to the former family Asclepiadaceae, now treated as subfamily Asclepiadoideae within Apocynaceae.
Plants are characterised by a liana habit with opposite leaves, and flowers borne in terminal or extra-axillary inflorescences that are umbel-like, paniculate, or raceme-like. The corolla is urceolate or campanulate with the throat often hairy and lobes twisted to the right. A distinctive feature is the corona of five erect, acuminate, fleshy lobes attached to the gynostegium. Fruits are follicles that are mostly thick, acuminate, and smooth or longitudinally winged.
The genus contains approximately 100 species (with around 69 currently accepted by Plants of the World Online as of 2026), distributed across tropical Asia, Africa, Australia, and the Americas, with 25 species occurring in China alone. Several well-known species include Marsdenia tenacissima, valued in traditional medicine in Asia, and Marsdenia tinctoria, used historically as a dye plant. Over its history, many former Marsdenia species have been transferred to related genera including Gymnema, Stephanotis, Cynanchum, and Vincetoxicum, reflecting the complex taxonomic history of the milkweed subfamily.
The genus is named in honour of William Marsden (1754–1836), a British orientalist, plant collector, and Secretary of the Admiralty.
Etymology
The genus name Marsdenia honours William Marsden (1754–1836), a British orientalist, plant collector, and Secretary of the Admiralty, after whom Robert Brown named the genus in 1810.
Distribution
Marsdenia is native to tropical regions spanning Asia, Africa, Australia, and the Americas. Approximately 25 species are found in China alone, with particularly high diversity across South and Southeast Asia and tropical Africa.
Taxonomy Notes
Marsdenia was described by Robert Brown in 1810 and historically placed in Asclepiadaceae, now treated as subfamily Asclepiadoideae within Apocynaceae. The genus has undergone substantial circumscription changes: numerous former species have been transferred to genera including Anisopus, Cynanchum, Gymnema, Stephanotis, Vincetoxicum, Blepharodon, Dischidia, Gongronema, Jasminanthes, Matelea, Pergularia, and Sinomarsdenia, among others. Plants of the World Online recognised approximately 69 accepted species as of February 2026, while some GBIF checklists list over 100 descendants.
