Abstract: Bracts, rays, bracteoles and fruit ribs morphology of 10 species of Pleurospermum Hoffm growing in Kun-Lun Mountains were observed using a stereomicroscope, and a key to the species is provided. The results show that the species can be divided into three groups in terms of their morphology: (1)Bracts and bracteoles are all lanceolate; (2)Bracts and bracteoles are all leaflike, apex pinnatifid; (3)Bracteoles are different from bracts. So the shapes of Bracts and bracteoles provide new evidence for taxonomy. These properties can be regarded as the taxonomic bases among the species of Pleurospermum Hoffm.

Key words: Pleurospermum Hoffm., Bracts and bracteoles morphology, taxonomy