For Cleistesiopsis
Cameron, K.M., and M.W. Chase. 1999. Phylogenetic relationships of Pogoniinae (Vanilloideae, Orchidaceae): an herbaceous example of the eastern North America - eastern Asia phytogeographic disjunction. J. Plant Res. 112: 317-329.
Cameron, K.M., M.W. Chase, W.M. Whitten, P.J. Kores, D.C. Jarrell, V.A. Albert, T. Yukawa, H.G. Hills, and D.W. Goldman. 1999. A phylogenetic analysis of the Orchidaceae: evidence from rbcL nucleotide sequences. Amer. J. Bot. 86: 208-224.
Catling, P.M., and K.B. Gregg. 1992. Systematics of the genus Cleistes in North America. Lindleyana 7: 57-73.
Correll, D.S. 1950. Native orchids of North America north of Mexico. Chronica Botanica Cp., Waltham, MA. 399 pp.
Gregg, K.B. 1991. Defrauding the deceitful orchid: pollen collection by pollinators of Cleistes divaricata and C. bifaria. Lindleyana 6: 214-220.
Gregg, K.B., and P.M. Catling. 2002. Cleistes. In Flora of North America Editorial Committee. 2002a. Flora of North America north of Mexico. Volume 26, Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford Univ. Press, New York, NY. 723 pp.
Pansarin, E.R., and F. de Barros. 2008. Taxonomic notes on Pogonieae (Orchidaceae): Cleistesiopsis, a new genus segregated from Cleistes, and description of two new South American species, Cleistes batistana and C. elongata. Kew Bulletin 63: 441-448.
Pansarin, E.R., and P.M. Brown. 2009. A new genus for the North American Cleistes. North American Native Orchid Journal 15: 50-58.
Pridgeon, A.M., P.J. Cribb, M.W. Chase, and F.N. Rasmussen. 1999c. Genera orchidacearum. Volume 3: Orchidoideae (part 2), Vanilloideae. Oxford Univ. Press.
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