Abstract
Stellaria abaensis sp. nov., from Sichuan Province (southwest China), is described and illustrated. It is similar to S. media, and S. reticulivena (Subsect. Stellaria) but can be distinguished from them by its longer petiole, terete stem, glabrous pedicel, and undulate tuberculate seeds. Original photographs, distribution map, SEM images of pollen grain, and a comparative morpological table, as well as an identification key for the related taxa are provided.