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| May 2006 at Hitach Coastal Park |
May 2006 at Hitach Coastal Park |
May 2006 at Hitach Coastal Park |
| Family | Cyperaceae |
| Scientific name | Bolboschoenus fluviatilis (Torrey) Soják |
| Synonyms | Bolboschoenus fluviatilis (Torrey) T.Koyama subsp. yagara (Ohwi) T.Koyama; Scirpus fluviatilis (Torrey) A. Gray; Scirpus maritimus (L.) Palla var. fluviatilis Torrey; Scirpus yagara Ohwi; Schoenoplectus fluviatilis (Torrey) M. Strong |
| Common name | (Japanese common name) uki-yagara (ウキヤガラ, 浮矢柄 [meaning: floating yagara (yagara = shaft of arrow)]) |
| (English common name) river bulrush | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) China, Taiwan, Indonesia, Australia, New Zealand, Canada, USA | |
| Habitat | Swamp |
| Chromosomal number | 2n=94, 110 |
| Description | Bulbs 3-4cm across. Culms 80-150cm tall, 7-11mm wide. Leaves 5-10mm wide. Flowers inflorescences 3-8cm across, flowering in May to October. Perennial plants. |
| Reference | Bolboschoenus fluviatilis (Torr.) Soják |
| Schoenoplectus fluviatilis (Torr.) M.T. Strong | |
| Bolboschoenus fluviatilis (Torrey) Soják | |
| Note | Japanese authors may divide Bolboschoenus fluviatilis into some local variations or subspecies. |
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| May 2006 at Hitach Coastal Park |
May 2006 at Hitach Coastal Park |
May 2006 at Hitach Coastal Park |
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| May 2007 at lowland swamp |
May 2007 at lowland swamp |
May 2007 at lowland swamp |
