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Cypripedium macranthos Swartz
in Kongl. Vetensk. Acad. Nya Handl., 21: 251 (1800).
Synonyms :
Cypripedium calceolus var. rubrum Georgi in Reise Russ. Reich., 1: 232 (1775).
Cypripedium calceolus sensu Thunberg non Linnaeus in Fl. Jap.: 30 (1794).
Sacodon macranthos (Swartz) Rafinesque in Fl. Tellur., 4: 45 (1836).
Cypripedium macranthos var. vulgare Reichenbach fil. in Icon. Florae Germ. Helv. Orch.: 210 (1851).
Cypripedium thunbergii Blume in Coll. Orchid.: 169, t. 59, fig. 2 (1859).
Cypripedium macranthos var. taiwanianum (Masam.) F. Maekwa in Wild Orchids of Japan in Colour: 80 (1971), nomen invalidum.
Cypripedium taiwanianum Masam. in Native Orchids of Nippon, 4: 68 (1987), nomen invalidum.
Cypripedium macranthon Swartz , Orthographical variant.
Cypripedium macranthum , Orthographical variant.

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)..)". 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 Cribb (1997) in The Genus Cypripedium.

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