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Cypripedium macranthos Swartz
in Kongl. Vetenskaps Academiens Nya Handlingar, 21: 251 (1800).
Synonyms :
Cypripedium calceolus var. rubrum Georgi in Bemerkungen einer Reise im Russischen Reich im Jahre 1772, 1: 232 (1775).
Cypripedium calceolus sensu Thunberg non Linnaeus in Flora Japonica: 30 (1784).
Sacodon macranthos (Swartz) Rafinesque in Flora Telluriana, 4: 45 (1836).
Cypripedium macranthos var. vulgare Reichenbach fil. in Icon. Florae Germ. Helv. Orch.: 210 (1851).
Cypripedium thunbergii Blume in Collection des Orchidées le plus remarquables de l'Archipel Indien et du Japon: 169, tab. 59, fig. 2 (1859).
Cypripedium macranthos var. maximum Nakai in Jap. J. Bot., 16: 63 (1940). (As Cypripedium macranthum var. maximum).
Cypripedium macranthos var. taiwanianum (Masamune) F. Maekwa in Wild Orchids of Japan in Colour: 80 (1971). (As Cypripedium macranthum var. taiwanianum.), nomen invalidum.
Cypripedium taiwanianum Masamune in Native Orchids of Nippon, 4: 68 (1987), nomen invalidum.
Cypripedium macranthos var. atropurpureum Averyanov in Turczaninowia, 2(2): 18 (1999). (As Cypripedium macranthon var. atropurpureum.)

Concerning the entity taiwanianum the following is said in Sander's List of Orchid Hybrids. 3 Year Addendum (2002-2004): "Not validly published, best treated as a cultivar 'Taiwanianum', Native Orch. Nippon 4: 68 (1987)..)". P.J. Cribb (1997) in The Genus Cypripedium considers this entity synonymous with Cyp. macranthos.
Type(s) : Lectotype: Illustration t.1, fig. 1 in Gmelin, Flora Sibirica, 1747. Selected by P.J. Cribb (1997) in The Genus Cypripedium.
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