For Oxypolis
Feist, M.A.E., and S.R. Downie. 2008. A phylogenetic study of Oxypolis and Ptilimnium (Apiaceae) based on nuclear rDNA ITS sequences. Syst. Bot. 33: 447-458.
Feist, M.A.E., S.R. Downie, A.R. Magee, and M. (R.) Liu. 2012. Revised generic delimitations for Oxypolis and Ptilimnium (Apiaceae) based on leaf morphology, comparative fruit anatomy, and phylogenetic analysis of nuclear rDNA ITS and cpDNA trnQ-trnK intergenic spacer sequence data. Taxon 61: 402-418.
Feist, M.A.E., S.R. Downie, A.R. Magee, and M. Liu. 2012. Revised generic delimitations for Oxypolis and Ptilimnium (Apiaceae) based on leaf morphology, comparative fruit anatomy, and phylogenetic analysis of nuclear rDNA ITS and cpDNA trnQ-trnK intergenic spacer sequence data. Taxon 61: 402:418.
Kral, R. 1981a. Notes on some "quill"-leaved umbellifers. Sida 9:124-134.
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.
Tucker, A.O., N.H. Dill, T.D. Pizzolato, and R.D. Kral. 1983. Nomenclature, distribution, chromosome numbers, and fruit morphology of Oxypolis canbyi and O. filiformis (Apiaceae). Syst. Bot. 8: 299-304.
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