| Family | Sparganiaceae |
| Scientific name | Sparganium fallax Graebner |
| Synonyms | Sparganium yamatense Makino |
| Common name | (Japanese common name) yamato mikuri (ヤマトミクリ, 大和実栗 [meaning: Yamato maron fruits (Yamato = an old name of Japan)]) |
| (English common name) none | |
| Distribution | (Japan) Honshu (west of Kanto region), Kyushu |
| (Other nations) China, Taiwan, Myanmar, India | |
| Habitat | Swamp |
| Chromosomal number | 2n=30 |
| Description | Plants electing 30-75cm tall. Leaves 5.5-13mm wide. Flowers flowering in July to August. Perennial plants. |
| Reference | Sparganium fallax Graebn. |
| July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |
| July 2007 at Tsukuba Botanical Garden |
July 2007 at Tsukuba Botanical Garden |