References
For Platanthera
Ackerman, J.D., and R. Morgan 2002. Piperia. 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. Google Scholar
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Correll, D.S. 1950. Native orchids of North America north of Mexico. Chronica Botanica Cp., Waltham, MA. 399 pp. Google Scholar
Efimov, P.G. 2016. A revision of Platanthera (Orchidaceae; Orchidoideae; Orchideae) in Asia. Phytotaxa 254: 1-233. Google Scholar
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