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

Trapa natans L.






Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

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.

索引

Trapa natans in China


ST1 ST2 ST3
[1/2] in Nan hu (南湖) in Changchun City, Jilin Prvince, northeastern China, on June 8 2017.

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