For Eryngium
Bell, C.R. 1963. The genus Eryngium in the southeastern United States. Castanea 28: 73-79.
Calviño, C.I., and G.A. Levin. 2019. A new species of Eryngium (Apiaceae, Saniculoideae) from the USA. Syst. Bot. 44: 446-450.
Calviño, C.I., and S.R. Downie. 2007. Circumscription and phylogeny of Apiaceae subfamily Saniculoideae based on chloroplast DNA sequences. Molecular Phylogenetics and Evolution 44: 175-191.
Calviño, C.I., S.G. Martínez, & S.R. Downie. 2008. The evolutionary history of Eryngium (Apiaceae, Saniculoideae): rapid radiations, long distance dispersals, and hybridizations. Molec. Phylogen. Evol. 46: 1129-1150.
Calviño, C.I., S.G. Martínez, & S.R. Downie. 2010. Unraveling the taxonomic complexity of Eryngium L. (Apiaceae, Saniculoideae): phylogenetic analysis of 11 non-coding cpDNA loci corroborates rapid radiations. Plant Div. Evol. 128: 137-149.
Mathias, M.E., and L. Constance. 1945. Umbelliferae. North American Flora, vol. 28B: 43-397. N.Y. Botanical Garden, New York.
Plunkett, G.M., M.G. Pimenov, J.-P. Reduron, E.V. Kljuykov, B.-E. van Wyck, T.A. Ostroumova, M.J. Henwood, P.M. Tilney, K. Spalik, M.F. Watson, B.-Y. Lee, F.-D. Pu, C.J. Webb, J.M. Hart, A.D. Mitchell, and B. Muckensturm. 2018. Apiaceae. In Kadereit, J., & V. Bittrich. 2018. The families and genera of flowering plants. XV. Flowering plants. Eudicots. Apiales, Gentianales (except Rubiaceae). Springer, Cham.
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