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Cypripedium ×ventricosum Swartz
in Kongl. Vetenskaps Academiens Nya Handlingar, 21: 251 (1800).
Synonyms :
Sacodon ventricosum (Swartz) Rafinesque in Flora Telluriana, 4: 46 (1838).
Cypripedium macranthos var. ventricosum (Swartz) Reichenbach fil. in Icon. Florae Germ. Helv. Orch.: 210 (1851).
Cypripedium ×freynii Karo in Oesterr. Bot. Zeitschr., 46: 97 (1896).
Cypripedium ×barbeyi E.G. Camus in Monographie des Orchidées: 453 (1908).
Cypripedium manchuricum Stapf in Botanical Magazine, 152: sub t. 9117 (1927).
Cypripedium ×kesselringii G. Keller in Monogr. Iconogr. Orchid. Eur., 2: 18 (1940), nomen nudum.
Cypripedium manschuricum Stapf , Orthographical error.

Cypripedium ventricosum Swartz - This taxon is by some considered a true species.
Type(s) : Siberia, illustration in Gmelin, Flora Sibirica: t. 1, 1747. Selected by P.J. Cribb (1997) in The Genus Cypripedium.
Description
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Comments : For some time there was some discussion if this taxon was a species or a natural hybrid. At the moment people tend to agree that it is a natural hybrid.