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References

For Harperella

Easterly, N.W. 1957. A morphological study of Ptilimnium. Brittonia 9: 136-145.

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.

Kress, W.J., G.D. Maddox, and C.S. Roesel. 1994. Genetic variation and protection priorities in Ptilimnium nodosum (Apiaceae), an endangered plant of the eastern United States. Conservation Biology 8: 271-276.

Maddox, D., and R. Bartgis. 1990. Harperella (Ptilimnium nodosum) recovery plan. U.S. Fish and Wildlife Service, Newton Corner, MA. 55 pp.

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.

Rose, J.N. 1911. Two new species of Harperella. Contr. U.S. Nat. Herb. 13: 289-290.

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