Abstract
A new species, Corydalis hualongshanensis (Papaveraceae), is described from southern Shaanxi, China. This new species is distinct in Corydalis sect. Fumarioide Lidén. It is most similar to C. fargesii Franch., but differs in having papillose-hairs that are finely distributed on the peduncle, the pedicel, the apical part of outer petal, and the surface of fruit. It is also similar to C. pseudofargesii H.Chuang and C. shennongensis H.Chuang, but differs from the former by its entire bracts and nectary that is about 2/3–4/5 length of spur, and from the latter by its spur that is two times as long as petal lobe. An identification key to the four species is provided.