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Taxon: Trapa natans L.

Genus: Trapa
Family: Lythraceae. Also placed in: Trapaceae
Nomen number: 36824
Place of publication: Sp. pl. 1:120. 1753
Typification: View record from Linnaean Plant Name Typification Project of the Natural History Museum of London.
Name verified on: 07-Nov-1985 by ARS Systematic Botanists. Last updated: 09-May-2011
No species priority site assigned.


A declared aquatic or terrestrial noxious weed and/or noxious-weed seed in these U.S. states (see state noxious weed lists), with links to state information or web documents:
ALª*, AZª*°, CTª, IDª*, INª, MAª, ME(as Tapa natans)ª, MIª, MNª, ORª, SCª, VTª, WAª.
ªAquatic. *Terrestrial. °In seed.
noxious weed information from Invaders Database System for northwestern U.S.
Link to species profile at National Invasive Species Information Center

See also subordinate taxa:

Common names:

  • bullnut   (Source: NPB State Noxweed WA []) – English
  • European water-chestnut   (Source: Edible Nuts WA) – English   [Trapa natans var. natans]
  • Jesuit's-nut   (Source: Dict Gard WA) – English   [Trapa natans var. natans]
  • singhara-nut   (Source: Dict Gard WA) – English   [Trapa natans var. bispinosa]
  • water caltrop   (Source: Dict Gard WA) – English   [Trapa natans var. natans]
  • water-chestnut   (Source: Dict Econ Pl WA) – English
  • water-chestnut   (Source: Dict Gard WA) – English   [Trapa natans var. natans]
  • châtaigne d'eau   (Source: Dict Rehm WA) – French   [Trapa natans var. natans]
  • cornue   (Source: Dict Rehm WA) – French   [Trapa natans var. natans]
  • macre commune   (Source: Dict Rehm WA) – French   [Trapa natans var. natans]
  • saligot   (Source: Pl Book WA) – French   [Trapa natans var. natans]
  • singhara Wassernuß   (Source: Zander Ency WA) – German   [Trapa natans var. bispinosa]
  • Wassernuß   (Source: Dict Rehm WA) – German   [Trapa natans var. natans]
  • castanha-d'água   (Source: Dict Rehm WA) – Portuguese   [Trapa natans var. natans]
  • abrojo de agua   (Source: Dict Rehm WA) – Spanish   [Trapa natans var. natans]
  • castaña de agua   (Source: Dict Rehm WA) – Spanish   [Trapa natans var. natans]
  • sjönöt   (Source: Vara kulturvaxt namn WA) – Swedish

Economic importance:


Distributional range:

    Northern Africa: Algeria; Tunisia
    Northeast Tropical Africa: Sudan
    East Tropical Africa: Tanzania; Uganda
    West Tropical Africa: Guinea-Bissau
    South Tropical Africa: Angola; Malawi; Mozambique; Zambia; Zimbabwe
    Southern Africa: Botswana; Namibia; South Africa - KwaZulu-Natal
    Western Asia: Turkey [n.w.]
    Caucasus: Georgia
    China: China - Hubei, Jiangxi, Sichuan, Yunnan, Zhejiang
    Eastern Asia: Japan
    Indian Subcontinent: India [n.w.]; Pakistan
    Indo-China: Vietnam
    Middle Europe: Austria; Czech Republic; Germany; Hungary; Poland; Slovakia; Switzerland
    East Europe: Belarus; Ukraine [incl. Krym]
    Southeastern Europe: Albania; Bulgaria; Croatia; Greece; Italy; Romania; Serbia; Slovenia
    Southwestern Europe: France; Spain [incl. Baleares]

  • widely naturalized elsewhere

  • also cultivated




Check other web resources for Trapa natans L.:


  • Check for additional images
  • Google Images Images Note: Be advised that their identity may be inaccurate. Proper identification of a plant may require specialized taxonomic knowledge or comparison with properly documented herbarium material.

Abbreviations & symbols in GRIN Taxonomy

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Cite as:
USDA, ARS, National Genetic Resources Program.
Germplasm Resources Information Network - (GRIN) [Online Database].
National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: (27 November 2015)

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