| Family | Cyperaceae |
| Scientific name | Eleocharis attenuata (Franchet & Savatier) Palla |
| Synonyms | Eleocharis laeviseta Nakai var. major (Nakai) H. Hara; Eleocharis major (Nakai) H. Hara; Scirpus attenuatus Franchet & Savatier |
| Common name | (Japanese common name) seitaka-hari-i (セイタカハリイ, 背高針藺 [meaning: tall needle rush]) |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu, Okinawa |
| (Other nations) Korea, China, New Guinea | |
| Habitat | Swamp |
| Chromosomal number | unknown |
| Description | Plants culms 25-55cm tall. Flowers 7-10mm long, flowering in July to October. Annual or perennial plants. |
| Reference | Eleocharis attenuata (Franch. & Sav.) Palla |
| June 2009 at Ohsaka City University Botanical Garden |
June 2009 at Ohsaka City University Botanical Garden |
| June 2009 at Ohsaka City University Botanical Garden |