| Family | Cyperaceae |
| Scientific name | Carex filipes Franchet & Savatier var. sparsinux (C. B. Clarke ex Franchet) Kükenthal |
| Synonyms | Carex filipes Franchet et Savatier subsp. rouyana (Franchet) T. Koyama; Carex filipes Franchet et Savatier var. rouyana (Franchet) Kükenthal; Carex rouyana Franchet; Carex sparsinux C. B. Clarke ex Franchet |
| Common name | (Japanese common name) oh-tama-turi-suge (オオタマツリスゲ, 大玉吊菅 [meaning: large ball hanging sedge]) |
| (English common name) none | |
| Distribution | (Japan) Honshu (Central region) |
| (Other nations) China | |
| Habitat | Mountane forest |
| Chromosomal number | 2n=38 |
| Description | Culms 30-40cm tall. Leaves 3-5mm wide. Flowers 3-4 spikelets each 1-1.5cm long, flowering in April to June. Perennial plants. |
| Note | Rare species. |
| May 2006 at mountane forest |
May 2006 at mountane forest |
May 2006 at mountane forest |