Cypripedium (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cypripedium" in English language version.

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efloras.org

Chen, Xinqi; Cribb, Phillip J. "Cypripedium". Flora of China – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Sheviak, Charles J. (2002). "Cypripedium". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 26. New York and Oxford: Oxford University Press – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Jowit, Juliette (3 August 2010). "Ghost orchid comes back from extinction". The Guardian. Retrieved 1 June 2015.