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| September 2008 at Ohsaka City University Botanical Garden |
September 2008 at Ohsaka City University Botanical Garden |
September 2008 at Ohsaka City University Botanical Garden |
| Family | Lythraceae (also placed in Trapaceae and Onagraceae) |
| Scientific name | Trapa japonica Flerow |
| Synonyms | Trapa bicornis Osbeck var. bispinosa (Roxburgh) Nakano; Trapa bicornis Osbeck var. iwasakii (Nakano) Nakano; Trapa bispinosa Roxburgh var. iinumae Nakano; Trapa bispinosa Roxburgh var. iinumai Nakano; Trapa korshinskyi V. N. Vassilczenko; Trapa litwinowii V. N. Vassilczenko; Trapa manshurica Flerow var. bispinosa Flerow; Trapa natans L. var. bispinosa (Roxburgh) Makino |
| Common name | (Japanese common name) hishi (ヒシ, 菱 [meaning: square shape weed]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Korea, China, Taiwan | |
| Habitat | Pond, swamp |
| Chromosomal number | 2n=96 |
| Description | Leaves 3-6cm across. Flowers white ca. 1cm across, flowering in July to October. Fruits ca. 3-5cm wide, 2 spikes. Annual plants. |
| Reference | Trapa natans L. var. bispinosa (Roxb.) Makino |
| Trapa natans L. | |
| Trapa natans Linnaeus | |
| Karyomorphology of Some Trapaceae in Japan | |
| Composition having physiological activity and production method thereof (US Patent 6953580/2005) | |
| Note | Fruits of Trapa natans var. quadrispinosa (2n=48) has 4 spikes; fruits of Trapa japonica Flerow (2n=96) has 2 spikes. |
| Flora of China has described that Trapa japonica Flerow is a synonym of Trapa natans L. (var. natans). |
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| September 2008 at Ohsaka City University Botanical Garden |
September 2008 at Ohsaka City University Botanical Garden |
September 2008 at Ohsaka City University Botanical Garden |
