| Family | Juncaceae |
| Scientific name | Luzula rufescens Fischer ex E. Meyer |
| Synonyms | none |
| Common name | (Japanese common name) kuroboshi-sou (クロボシソウ, 黒星草 [meaning: black star weed]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Russia, Korea, China, Mongolia, Canada, USA | |
| Habitat | Mountane forest edge |
| Chromosomal number | 2n=52 |
| Description | Leaves 3-5mm wide. Scapes electing 15-25cm tall. Flowers tepals 2.5-3mm, flowering ordinary in April to May. Seeds 4mm long. Perennial plants. |
| Reference | Luzula rufescens Fischer ex E. Meyer |
| Luzula rufescens Fisch. ex E. Mey. |
| May 2006 at mountane forest edge |
May 2006 at mountane forest edge |
May 2006 at mountane forest edge |