Zhou, J., Niu, J., Guo, M., Wang, P. and Liu, Z. 2021. Rediscovery of Pimpinella crispulifolia (Apiaceae) after one century, and its new phylogenetic placement in Sium. Phytotaxa. 487, 2 (Feb. 2021), 157–163. DOI:https://doi.org/10.11646/phytotaxa.487.2.6.