Yuan, Q. & Yang, Q.-E. (2022)

Taxonomic studies on the genus Delphinium (Ranunculaceae) from China (XXII): Clarifying morphological distinction between D. drepanocentrum and D. umbrosum and synonymizing D. umbrosoides with D. drepanocentrum

. Phytotaxa 572 (3): 243–258. https://doi.org/10.11646/phytotaxa.572.3.3