References

For Pimpinella

Ball, P.W., and G.A. Levin. 2024. Pimpinella. In Flora of North America Editorial Committee. 2024. Flora of North America north of Mexico. Volume 13, Magnoliophyta: Geraniaceae to Apiaceae. Oxford Univ. Press, New York, NY. 566 pp. Google Scholar

Mathias, M.E., and L. Constance. 1945. Umbelliferae. North American Flora, vol. 28B: 43-397. N.Y. Botanical Garden, New York. Google Scholar