Abstract: A new species of the genus Delphinium (Ranunculaceae) from Tianshan, Xinjiang, China, D. neowentsaii C. Y. Yang, is described and illustrated. The new species is similar to D. laxiflorum DC. in having leaves reniform, petioles not dilated at base, flowers small, inflorescence laxly racemose, pedicels adpressed pubescent, spur of the upper sepal conic-subulate, 13-15 mm long, 3 mm wide at base, outside pubescent, sepals blue, but differs by having both petals and staminodes yellowish.

Key words: Delphinium, Delphinium neowentsaii C. Y. Yang, Ranunculaceae, new species