| Family | Ranunculaceae |
| Subfamily | Isopyroideae |
| Tribe | Isopyreae |
| Subtribe | Isopyrineae |
| Scientific name | Dichocarpum trachyspermum (Maximovicz) W.T.Wang et Hsiao |
| Synonyms | Isopyrum trachyspermum Maximovicz |
| Common name | (Japanese common name) tougoku-saba-no-o (トウゴクサバノオ, 東国鯖尾 [meaning: eastern region mackerel's tail]) |
| (English common name) none | |
| Distribution | (Japan) Honshu (south of Miyagi prefecture), Shikoku, Kyushu |
| (Other nations) none | |
| Habitat | Mountane wet forest edge |
| Chromosomal number | 2n=36 |
| Description | Plants 10-20cm tall. Flowers five light yellow or white sepals each 5-7mm long, flowering in April to May. Perennial plants. |
| Note | Native to Japan |
| April 2007 at mountaine forest |
April 2007 at mountaine forest |
April 2007 at mountaine forest |
| April 2006 at mountaine forest |
April 2006 at mountaine forest |
April 2006 at mountaine forest |
| April 2006 at mountaine forest |
April 2006 at mountaine forest |
| May 2007 at Mt. Tsukuba |
May 2007 at Mt. Tsukuba |