(subg. , Selaginellaceae), a new spikemoss species from China based on morphological and molecular data.

A new species of spikemoss, in S.subg.Heterostachyssect.Tetragonostachyae, China, is described from southeastern Xizang, based on morphological and molecular phylogenetic data. Morphologically, is similar to , and , but the new species can be easily distinguished from them by having sterile leaves margins densely ciliate, symmetrical axillary leaves oblong ovate to ovate-triangular, and ovate dorsal leaves obviously carinate. Molecular phylogenetic analysis resolves as sister to the clade comprised with and , which confirms the recognition of the new species.