For Cypripedium
Case, M.A., H.T. Mlodozeniec, L.E. Wallace, and T.W. Weldy. 1998. Conservation genetics and taxonomic status of the rare Kentucky lady's slipper: Cypripedium kentuckiense (Orchidaceae). Amer. J. Bot. 85: 1779-1786.
Correll, D.S. 1950. Native orchids of North America north of Mexico. Chronica Botanica Cp., Waltham, MA. 399 pp.
Edens-Meier, R., M. Arduser, G.R. Camilo, and M.J. Tackett. 2021. Pollination ecology and breeding systems of Cypripedium kentuckiense (Orchidaceae) in Tennessee. J. Torrey Bot. Soc. 148(1): 53-74.
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.
Sheviak, C.J. 1994. Cypripedium parviflorum Salisb. I. The small-flowered varieties. Amer. Orchid Soc. Bull. 63: 664-669.
Sheviak, C.J. 2002a. Cypripedium. 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.
Wallace, L.A., and M.A. Case. 2000. Contrasting allozyme diversity between northern and southern populations of Cypripedium parviflorum (Orchidaceae): implications for Pleistocene refugia and taxonomic boundaries. Syst. Bot. 25: 281-296.
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