Cypripedium macranthos Sw. 1800 SECTION Cypripedium SUBSECTION Macrantha Photo by © Pieter C. Brouwer and his Photo Website

Another Angle w/Staminode Photo courtesy of Jan H. Larsen KJ Orchids Denmark

Full shadeCold LATESpring To EARLYSummer

Common Name The Large Flowered Cypripedium - in Japan - Atsumori-So - In China Da Hua Shao Lan

Flower Size 3" [7.5 cm]

Found in Belarus, eastern Russia, China, Mongolia, Japan, Korea and Taiwan in humus rich and well drained soils in forests and on scrubby slopes at elevations of 500 to 2300 meters as a medium sized, cold growing terrestrial with a leaf stem carrying 3 to 6, oblong, alternate, plicate leaves that blooms in the late spring and early summer on a terminal, erect, 1 to 2 flowered inflorescence with large leaflike bracts.

Synonyms Cypripedium calceolus var. rubrum Georgi 1775; Cypripedium macranthos f. albiflorum (Makino) Ohwi 1965; Cypripedium macranthos f. rebunense (Kudô) Ohwi 1953; Cypripedium macranthos nothof. alboroseum Aver. 1999; Cypripedium macranthos nothof. albostriatum Aver. 1999; Cypripedium macranthos nothof. flavoroseum Aver. 1999; Cypripedium macranthos var. albiflorum Makino 1926 Cypripedium macranthos var. atropurpureum Aver. 1999; Cypripedium macranthos var. flavum Mandl 1924 ; Cypripedium macranthos var. maximum Nakai 1940; Cypripedium macranthos var. speciosum (Rolfe) Koidz. 1926; Cypripedium neoparviflorum Y.N.Lee 2002; Cypripedium speciosum Rolfe 1911; Cypripedium speciosum var. albiflorum Makino 1926; Cypripedium thunbergii Blume 1859; Cypripedium thunbergii f. albiflorum (Makino) Okuyama 1955; Cypripedium ventricosum Sw.; Sacodon macranthon (Sw.) Raf.; Sacodon ventricosum Raf. 1836

References W3 Tropicos, Kew Monocot list , IPNI ; Icones plantarum formosanarum nec non et contributiones ad floram formosana Hayata 1912; Die Orchideen Schlechter 1915 as C macranthum; Atlas des Orchidees Cultivees Constantin 1920 as C macranthum drawing good; AOS Bulletin Vol 29 No 3 1960 photo; Encyclopedia of Cultivated Orchids Hawkes 1965; Die Orchideen #4 13-16 tafel 5 Rudolph Schlechter 1971 photo fide; AOS Bulletin Vol 50 No 8 1981 Photo; AOS Bulletin Vol 65 No 11 1996 photo; Wild Orchids of China Tsi, Chen Mori 1997; Native Orchids of China in Colour Singchi, Zhanhuo and Yibo 1999 photo fide; Lindleyana Vol,15 No 4 2000; Rudolf Schlechter Die Orchideen Lieferung 40 2000; AOS Bulletin Vol 71 No 12 2002 Photo as C speciosum; Orchids of Bhutan Pearce & Cribb 2002; Orchids of Europe, North Africa and the Middle east Delforge 2005; Native Orchids of Shaanxi Shaanxi Science & Technology Press 2007 photo fide; A Field Guide to the Orchids of China Singchi, Zhongjian, Yibo, Xiaohua and Zhanhuo 2009 photo fide; Flora of China Vol 25 Zhengyi, Raven & Deyuan 2009; Flora of China Vol 25 Illustrations Zhengyi, Raven & Deyuan 2010 drawing fide;

Cypripedium macranthum var. album Mandel. 1924 Photos courtesy of Rogier van Vugt © and his Orchid webpage

Another Angle Photo courtesy of Botanická zahrada a arboretum Mendelova zemedelská a lesnická univerzita v Brne, Brno, Czech

A white color form of the previous orchid occuring in Russia, Mongolia, China and North Korea

References W3 Tropicos, Kew Monocot list , IPNI ; AOS Bulletin Vol 29 No 3 1960; AOS Bulletin Vol 65 No 11 1996 photo; Lindleyana Vol,15 No 4 2000;

Cypripedium macranthon var rebunense Miyabe & Kudô Photos courtesy of Natsui from Japan and his Japan Orchids Page

Common Name The Rebun Cypripedium [An Island near Hokkaido] in Japan - Rebun-Atsumori-So

Flower Size 4.42" [11.6 cm]

Found on Rebun Island Japan as a small to medium sized, cold growing terrestrial that blooms in the spring.

Synonyms Cypripedium macranthos Swartz forma rebunense (Kudo) Miyabe & Kudo; Cypripedium macranthos Swartz var. flavum Mandl; Cypripedium rebunense Kudo 1925

References W3 Tropicos, Kew Monocot list , IPNI ; AOS Bulletin Vol 29 NO 3 1960 photo as Hotei-Atsumore; Orchid Digest Vol 48 No 1 1984 photo fide;

Cypripedium macranthum Sw. 1800 var speciosum Photo courtesy of Jan H. Larsen KJ Orchids Denmark

--------------------------------------------------------------------------------------------------------------------------