| Family | Onagraceae |
| Subfamily | Onagroideae |
| Tribe | Circaeeae |
| Scientific name | Circaea cordata Royle |
| Synonyms | Circaea bodinieri H. Léveillé; Circaea cardiophylla Makino; Circaea codiophylla Makino; Circaea kitagawae H. Hara |
| Common name | (Japanese common name) ushitaki-sou (ウシタキソウ, 牛滝草 [meaning: Mt. Ushitaki weed]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Russia (Far East), Korea, China, Taiwan, Nepal, India, Pakistan | |
| Habitat | Mountane forest edge |
| Chromosomal number | 2n=22 |
| Description | Plants 40-60cm tall. Leaves 4-10cm long, 3-6cm wide. Flowers white, flowering in July to September. Fruits ca. 3mm long. Pelennial plants. |
| Reference | Circaea cordata Royle |
| Circaea cordata Royle |
| July 2007 at lowland forest edge |
July 2007 at lowland forest edge |
July 2007 at lowland forest edge |
| July 2007 at lowland forest edge |
| July 2007 at lowland forest edge |
July 2007 at lowland forest edge |