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| July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |
| Family | Hypericaceae (alt. Guttiferae) |
| Scientific name | Hypericum ascyron L. |
| Synonyms | Ascyrum sibiricum Lamarck ex Poiret; Hypericum ascyron L. subsp. ascyron; Hypericum ascyron L. var. giraldii R. Keller; Hypericum ascyron L. var. hupehense Pampanini; Hypericum ascyron L. var. longistylum Maximowicz; Hypericum ascyron L. var. micropetalum R. Keller; Hypericum ascyron L. var. umbellatum R. Keller; Hypericum biondii R. Keller; Hypericum hemsleyanum H. Léveillé & Vaniot; Hypericum longifolium H. Léveillé; Hypericum scallanii R. Keller; Roscyna gmelinii Spach; Roscyna japonica Blume |
| Common name | (Japanese common name) tomoe-sou (トモエソウ, 巴草 [meaning: eddy shaped flower weed]) |
| (English common name) great St. Johnswort | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Russia, Korea, China, Taiwan, Mongolia | |
| Habitat | Mountane swamp |
| Chromosomal number | n=9, 2n=18 |
| Description | Plants electing 50-100cm tall. Leaves 5-10cm long, 1-3cm wide. Flowers yellow 5 petals each 2.5-3cm long, flowering in June to August. Perennial plants. |
| Reference | Hypericum ascyron Linnaeus |
| Hypericum ascyron L. |
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| July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |
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| April 2009 at Tsukuba Botanical Garden |
