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(Upload on August 30 2017) [ 日本語 | English ]

Trapa L. (ヒシ) Onibishi (オニビシ, 鬼菱), water caltrop, water chestnut, buffalo nut, etc. Lifeform: annual aquatic forb Distribution: widespread in eastern Asia, including Japan (south to Honshu) Habitat: waterlogged wetlands, such as ponds and swamps → wetland (湿原) Chromosome number: 2n = 48 Edible plant Synonyms var. japonica Nakai, often used Trapa amurensis Flerow Trapa natans L. var. rubeola Makino Trapa natans L. var. quadrispinosa Makino, excl. basion.

Trapa natans L. f. quadrispinosa Makino, excl. basion. Trapa manshurica Flerow Trapa manshurica Flerow var. tranzschelii (V. Vassil.) Kitag. Trapa japonica Flerow var. rubeola (Makino) Ohwi Trapa natans L. var. rubeola Makino f. viridis Sugim. var. pumila Nakano ex Verdc. (コオニビシ) Synonyms: Trapa potaninii V. Vassil. Trapa japonica Flerow var. pumila (Nakano ex Verdc.) Ohba, comb. nud. Trapa gracilipes Sugim.

Trapa natans in northeastern China

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[1/2] in Nan hu (南湖) in Changchun City, Jilin Prvince, northeastern China, on June 8 2017.