Cypripedium macranthos Sw. 1800 SECTION Cypripedium SUBSECTION Macrantha

Photo by © Pieter C. Brouwer and his Photo Website

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

LATE To EARLY

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 short rhizome giving rise to an erect, slightly pubescent to glabrous stem provided with several basal sheaths and carrying 3 to 6, oblong, alternate, plicate, slightly pubescent to glabrescent on the veins on both sides, minutely ciliate, acuminate to subacute leaves that blooms in the late spring and early summer on a terminal, erect, peduncle pubescent or glabrous, 1 to 2 flowered inflorescence with large leaflike, elliptic to rarely elliptic-lanceolate, both surfaces often pubescent on veins, shortly acuminate, twice as long as the ovary floral 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 fide; Encyclopedia of Cultivated Orchids Hawkes 1965; Die Orchideen 3 Auflage Bd 1 Sonderabdruck aus Schlechter Lieferung 4 193 to 256 Brieger, Maatsch and Senghas 1971 photo fide; Die Orchideen 3 Auflage Bd 1 Sonderabdruck aus Schlechter Lieferung 4 193 to 256 Brieger, Maatsch and Senghas 1971 as C speciosa; AOS Bulletin Vol 44 #9 1975 photo fide; AOS Bulletin Vol 50 No 7 1981 Photo fide; Orchid Digest Vol 48 no 1 1984 as C marcranthum f rebunense photo fide; AOS Bulletin Vol 65 No 11 1996 photo fide; Wild Orchids of China Tsi, Chen Mori 1997; Orchid Digest Vol 62 #1 1998 photo fide; Orchid Digest Vol 62 #3 1998 photo fide; Orchid Digest Vol 62 #4 1998 photo fide; Native Orchids of China in Colour Singchi, Zhanhuo and Yibo 1999 photo fide; Lindleyana Vol,15 No 4 2000; Rudolf Schlechter Die Orchideen Band 1C lieferung 40 pg 2492 - 2564 Brieger 2000; AOS Bulletin Vol 71 No 12 2002 as C speciosum Photo fide; Orchids of Bhutan Pearce & Cribb 2002; Orchids of Europe, North Africa and the Middle east Delforge 2005; AOS Bulletin Vol 76 #11 2007 photo fide; 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; AOS Bulletin Vol 84 #4 2015 photo fide; AOS Bulletin Vol 85 #3 2016 photo fide;

Cypripedium macranthos nothof. flavoroseum Aver. 1999

Photo by © Leonid Averyanov

References W3 Tropicos, Kew Monocot list , IPNI ; Orchid Digest Vol 65 #3 2001 as C macranthis f flavo-roseum; Atlas of Native Orchids of China Vol 1 Jin Xiaohua, Li Jianwu and Ye Deping 2019 photo fide

Cypripedium macranthum var. album Mandel. 1924

Photo by 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 fide; Orchid Digest Vol 62 #1 1998 photo fide; Lindleyana Vol. 15 No 4 2000;

Cypripedium macranthos var. atropurpureum Aver. 1999

Photo by © Leonid Averyanov

References W3 Tropicos, Kew Monocot list , IPNI ; Orchid Digest Vol 65 #3 2001

Cypripedium macranthos var. flavum Mandl 1924

References W3 Tropicos, Kew Monocot list , IPNI ; Orchid Digest Vol 65 #3 2001

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 as Rebun-Atsumore photo fide; Orchid Digest Vol 48 No 1 1984 photo fide;

Cypripedium macranthum Sw. 1800 var speciosum

Photo by Jan H. Larsen KJ Orchids Denmark

References W3 Tropicos, Kew Monocot list , IPNI ; Orchid Digest Vol 62 #1 1998 photo fide;

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