Spiranthes sunii (Orchidaceae), from southern Gansu, China, is described as new. A table is provided to highlight features distinguishing it from the only other species of Spiranthes in China, S. sinensis. Spiranthes sunii, named in recognition of Professor Sun Xuegang (), is known only from the vicinity of Fanba in Wen Xian, Gansu Province. A photo and an analytical drawing are provided.
Spiranthes sunii (Orchidaceae) S. sinensisSpiranthes (Spiranthes sunii)