For Calopogon
Correll, D.S. 1950. Native orchids of North America north of Mexico. Chronica Botanica Cp., Waltham, MA. 399 pp.
Goldman, D.H., C. van den Berg, and M.P. Griffith. 2004. Morphometric circumscription of species and infraspecific taxa in Calopogon R. Br. (Orchidaceae). Plant Syst. Evol. 247: 37-60.
Goldman, D.H., L.K. Magrath, amd P.M. Catling. 2002. Calopogon. 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.
Goldman, D.H., R.K. Jansen, C. van den Berg, I.J. Leitch, M.F. Fay, and M.W. Chase. 2004. Molecular and cytological examination of Calopogon (Orchidaceae, Epidendroideae): circumscription, phylogeny, polyploidy and potential hybrid speciation. Amer. J. Bot. 91: 707-723.
Trapnell D.W., J.L. Hamrick, and D.E. Giannasi. 2004. Genetic variation and species boundaries in Calopogon (Orchidaceae). Syst. Bot. 29: 308-315.
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