For Hexalectris
Catling, P.M. 2004. A synopsis of the genus Hexalectris in the United States and a new variety of Hexalectris revoluta. Native Orchid Conference Journal 1: 5-25.
Catling, P.M., and V.S. Engel. 1993. Systematics and distribution of Hexalectris spicata var. arizonica (Orchidaceae). Lindleyana 8: 119-125.
Correll, D.S. 1950. Native orchids of North America north of Mexico. Chronica Botanica Cp., Waltham, MA. 399 pp.
Goldman, D.H., R.A. Coleman, L.K. Magrath, and P.M. Catling. 2002. Hexalectris. 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.
Kennedy, A.H., and L.E. Watson. 2010. Species delimitation and phylogenetic relationships within the fully myco-heterotrophic Hexalectris (Orchidaceae). Syst. Bot. 35: 64-76.
Sosa, V. 2007. A molecular and morphological phylogenetic study of subtribe Bletiinae (Epidendreae, Orchidaceae). Syst. Bot. 32: 34-42. ttps://doi.org/10.1600/036364407780360175
Sosa, V., and M.W. Chase. 2020. New combinations and a new name in Bletia (Bletiinae; Orchidaceae). Phytotaxa 456 (3): 296-298.
Sosa, V., K.M. Cameron, D.F. Angulo, and T Hernández-Hernández. 2016. Life form evolution in epidendroid orchids: ecological consequences of the shift from epiphytism to terrestrial habit in Hexalectris. Taxon 65: 235–248. https://doi.org/10.12705/652.2
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