Argyreia subrotunda, a new species from Yunnan Province, China, is described and illustrated. The new species resembles A. fulvocymosa and A. wallichii, but differs from these in the flowers with an entire or shallowly lobed corolla, as well as smaller elliptic bracts, lax flat-topped cymes and shorter corolla tubes. An updated key to the species of Argyreia from Yunnan province is also provided.
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