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Cypripedium calceolus Linnaeus
in Species Plantarum, 2: 951 (1753).
Synonyms :
Calceolus marianus Crantz in Stirpium Austriarum Fasciculus, edition 2, 2(6): 454 (1769), nomen superfluum.
Cypripedium boreale Salisbury in Prodromus Stirpium in Horto ad Chapel Allerton vigentium: 10 (1796), nomen superfluum.
Cypripedium ferrugineum Gray in A Natural Arrangement of British Plants, 2: 213 (1821), nomen superfluum.
Cypripedium atsmori C. Morren in La Belgique Horticole, 1: 171, t. 21 (1851).
Cypripedilum calceolus Ascherson in Flora der Provinz Brandenburg: 700 (1864), sphalm. pro Cypripedium calceolus.
Cypripedium cruciatum Dulac in Flore du Département des Hautes-Pyrénées: 128 (1867).
Calceolus alternifolius Saint-Lager in Annales de la Société Botanique de Lyon, 7: 62, 124 (1880), nomen superfluum.
Cypripedilon marianus (Crantz) Rouy in Journal de Botanique, 8: 58-59 (1894).
Cypripedium calceolus var. atsmori (C. Morren) Pfitzer in A. Engler, Das Pflanzenreich, IV. 50. Orchidaceae-Pleonandrae (Heft 12): 37 (1903).
Cypripedium microsaccos Kränzlin in Journ. Russe Bot., 1913: 54 (1913).
Calceolus mariae Dodoëns
Type(s) : Lectotype: Dodoëns, Stirp. hist. pempt., ed. 2: 180, fig. 1, 1616.
Varieties & Forms :

Other names that can be found:
var. album Pfitzer in A. Engler, Das Pflanzenreich, IV. 50. Orchidaceae-Pleonandrae (Heft 12): 37 (1903). - With white lip.
f. biflorum Rouy in Fl. France, 13: 90 (1912). - With two flowers.
var. citrinum Hergt in Mittheilungen des Thüringischen Botanischen Vereins, 13: 120 (1899). - With lemon-yellow flower petals.
f. flavum Rion in Guide bot. Valais: 201 (1872). - With yellow flower petals.
f. fulvum H. Christ in Mittheilungen des Thüringischen Botanischen Vereins, 13: 120 (1899). - Yellow flowers with a rust-coloured hue.
var. helveticum Correvon in Orchid. rustiqu.: 72 (1892)
l. ochrocheilum O. Schwarz in Mittheilungen des Thüringischen Botanischen Vereins, 36: 28 (1925). - With brown-purple sepals and petals, and a pale yellow lip.
f. ochroleucum
f. triflorum Rouy in Fl. France, 14: 516 (1913). - With three flowers.
f. variegatum Ruppert ex W. Zimm. in Form. Orchid. Deutschl.: 12 (1912). - With brown speckled bracts.
f. viridiflorum M. Schulze in Mittheilungen des Thüringischen Botanischen Vereins, 10: 67 (1897). - With green or greenish sepals and petals.
f. viridifuscum G. Keller in Monogr. Iconogr. Orchid. Eur., 2: 15 (1930). - Yellow-green flowers with purple dots and stripes.
Description
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