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| May 2006 at my home |
| Family | Orchidaceae |
| Subfamily | Cypripedioideae (also placed in Cypripediaceae) |
| Tribe | Cypripedieae |
| Subtribe | Cypripediinae |
| Scientific name | Cypripedium japonicum Thunberg |
| Synonyms | Cypripedium cathayenum S.S.Chien, Cypripedium japonicum Thunberg var. glabrum M.Suzuki |
| Common name | (Japanese common name) kumagai-so (クマガイソウ, 熊谷草 [meaning: Kumagai's weed (Kumagai = Kumagai Naozane = a famous samurai in medieval Japan)]) |
| (English common name) Japanese Cypripedium | |
| Distribution | (Japan) Hokkaido (Southwestern region), Honshu, Shikoku, Kyushu |
| (Other nations) Korea, China | |
| Habitat | Mountane coniferous or bamboo forest |
| Chromosomal number | unknown |
| Description | Plants 20-40cm tall. Leaves 10-22cm across. Flowers single, ca. 10cm across, flowering in April to May. Terrestrial. Perennial plants. |
| Reference | Cypripedium japonicum Thunb. 1784 |
| Cypripedium japonicum Thunb. | |
| The evolutionary history of mycorrhizal specificity among Lady's Slipper Orchid | |
| Note | Rare species |
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| May 2006 at my home |
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| April 2006 at Tsukuba Botanical Garden |
April 2006 at Tsukuba Botanical Garden |
April 2006 at Tsukuba Botanical Garden |
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| May 2009 at Karuizawa Botanical Garden |
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| April 2009 at a Nursery |
