| Family | Cyperaceae |
| Scientific name | Carex foliosissima Fr. Schmidt |
| Synonyms | none |
| Common name | (Japanese common name) oku-no- kan-suge [oku winter sedge (Oku = an old name of northern Honshu)] |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Kyushu |
| (Other nations) Russia (Sakhalin) | |
| Chromosomal number | 2n=30 |
| Description | Leaves 5-10mm wide. Culms 20-40cm tall. Flowers flowering in April to June. Perennial plants. |
| April 2006 at Mt. Tsukuba |
April 2006 at Mt. Tsukuba |
April 2006 at Mt. Tsukuba |
| April 2006 at Mt. Tsukuba |
April 2006 at Mt. Tsukuba |