Abstract:Corydalis Sect. Mucronatae Fedde ex C. Y. Wu et Z. Y. Su is an endemic section from west China, which comprises 6 species and 2 varieties, belonging to two series. It distributes in Sichuan, Yunnan and Guizhou provinces and reachs its greatest morphological diversity and concentration of species in W. Sichuan region. A brief diagnosis of the section is provided and four new species, two new varieties are described, viz. C. longkiensis, C. kailiensis, C. pinnata and C. longicalcarata in company with its var. non-saccata and var. multipinnata.