| Family | Cyperaceae |
| Scientific name | Schoenoplectus triqueter (L.) Palla |
| Synonyms | Hymenochaeta triqueter (L.) Nakai; Scirpus pollichii Grenier & Godron; Scirpus pollichii Grenier & Godron var. coriacea Francet et Savatier; Scirpus trigonus Roth; Scirpus triqueter L. |
| Common name | (Japanese common name) sankaku-i (サンカクイ, 三角藺 [meaning: trianglar rush]) |
| (English common name) triangular club-rush, chair maker's rush | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu, Okinawa |
| (Other nations) Eurasia, Egypt, South Africa | |
| Habitat | Swamp |
| Chromosomal number | 2n=40, 42 |
| Description | Plants culms 50-120cm tall. Flowers 4-10 spikelets each 8-12mm long, flowering in July to October. Perennial plants. |
| Reference | Schoenoplectus triqueter (L.) Palla |
| Schoenoplectus triqueter (Linnaeus) Palla |
| July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |