References

Ball, P.W. and A.A. Reznicek 2002. Carex. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Binns, S.E., B.R. Baum, and J.T. Arnason. 2002. A taxonomic revision of Echinacea (Asteraceae: Heliantheae). Systematic Botany 27: 610–632.

Blomquist, H.L. 1957. A revision of Hexastylis of North America. Brittonia 8(4): 255–281.

Britton, N.L. and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Scribner's Sons, New York

Brodo, I.M., S.D. Sharnoff, and S. Sharnoff. 2001. Lichens of North America. Yale University Press, New Haven.

Case, F.W. and R.B. Case. 1976. The Sarracenia rubra complex. Rhodora 78: 270–325.

Cholewa, A.F. and D.M. Henderson. 2002. Sisyrinchium. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Crins, W.J. 2002. Carex sect. Ceratocystis. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Feist, M.E. and S.R. Downie. 2008. A phylogenetic study of Oxypolis and Ptilimnium (Apiaceae) based on nuclear rDNA ITS sequences. Systematic Botany 33: 447–458.

Fuse, S. and M.N. Tamura. 2000. A phylogenetic analysis of the plastid matK gene with emphasis on Melanthiaceae sensu lato. Plant Biology 2: 415–427.

Gaddy, L.L. 1987. A review of the taxonomy and biogeography of Hexastylis (Aristolochiaceae). Castanea 52: 186–196.

Gaddy, L.L. 2011. A new species of Hexastylis (Aristolochiaceae) from the Sandhills of North and South Carolina. Phytoneuron 2011-47: 1–5.

Godt, M.J.W. and J.L. Hamrick. 1996. Genetic diversity and morphological differentiation in Liatris helleri (Asteraceae), a threatened plant species. Biodivers. and Conserv. 5: 461–471.

Haynes, R.R. and C.B. Hellquist. 2000. Sagittaria. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Keener, C.S. 1976. Studies in the Ranunculaceae of the southeastern United States II. Thalictrum L. Rhodora 78: 457-471.

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

LeBlond, R.J., A.S. Weakley, A.A. Reznicek, and W.J. Crins. 1994. Carex lutea (Cyperaceae), a rare new coastal plain endemic from North Carolina. Sida 16: 153–161.

McDaniel, S. 1971. The genus Sarracenia (Sarraceniaceae). Bulletin of the Tall Timbers Research Station 9: 1–36.

Mehrhoff, L.A. and M.A. Homoya. 2002. Isotria. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Mellichamp, T.L. and F.W. Case. 2009. Sarracenia. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Mosyakin, S.L. and K.R. Robertson. 2004. Amaranthus. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Nesom, G. 2005. Broadened concept of Liatris helleri (Asteraceae: Eupatorieae). Sida 21: 1323–1333.

Nesom, G.L. 2006. Liatris. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Neyland, R. and M. Merchant. 2006. Systematic relationships of Sarraceniaceae inferred from nuclear ribosomal DNA sequences. Madroño 53: 223–232.

Oswald, W.W., E.D. Doughty, G. Ne'eman, R. Ne'eman, and A.M. Ellison. 2011. Pollen morphology and its relationship to taxonomy of the genus Sarracenia (Sarraceniaceae). Rhodora 113: 235–251.

Park, M.M. 1992. Biosystematic study of Thalictrum sect. Leucocoma. PhD dissertation, Pennsylvania State University

Park, M.M. and D. Festerling, Jr. 1997. Thalictrum. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Patrick, T.S., J.R. Allison, and G.A. Krakow. 1995. Protected plants of Georgia. Georgia Department of Natural Resources, Wildlife Resources Division, Georgia Natural Heritage Program.

Radford, A.E., H.E. Ahles, and C.R. Bell. 1968. Manual of the vascular flora of the Carolinas. University of North Carolina Press, Chapel Hill.

Schilling, E.E. 2006. Helianthus. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Schnell, D.E. 1977. Infraspecific variation in Sarracenia rubra Walt.: Some observations. Castanea 42: 149–170.

Sheviak, C.J. 2002. Platanthera. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Sorrie, B.A., B.R. Keener, and A.L. Edwards. 2007. Reinstatement of Sagittaria macrocarpa (Alismataceae). J. Bot. Res. Inst. Texas 1(1): 345–350.

Tanaka, N. 1998. Phylogenetic and taxonomic studies on Helonias, Ypsilandra and Heloniopsis III. Taxonomic revision. J. Jap. Bot. 73(2): 102–115.

Urbatsch, L.W., K.M. Neubig, and P.B. Cox. 2006. Echinacea. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Weakley, A.S. 2008. Flora of the southern and mid-Atlantic states. Draft courtesy of the author, University of North Carolina-Chapel Hill Herbarium.

Weakley, A.S. 2010. Flora of the southern and mid-Atlantic states. Draft courtesy of the author, University of North Carolina-Chapel Hill Herbarium.

Weakley, A.S. 2015. Flora of the southern and mid-Atlantic states. Draft courtesy of the author, University of North Carolina-Chapel Hill Herbarium.

Whittemore, A.T. and L.L. Gaddy. 1997. Hexastylis. In: Flora of North America, Flora of North America North of Mexico, Flora of North America Editorial Committee, eds. Oxford University Press, New York.

Yoshimura, I. A.J. Sharp. 1968. A revision of the genus Gymnoderma. American Journal of Botany 55: 635–640.