*Trapa natans Linnaeus. Common name: European Water-chestnut, Water-caltrop, Four-spined Water-chestnut. Phenology: Jun-Sep. Habitat: Farm ponds and other stagnant or slow-moving water. Distribution: Native of Eurasia and Africa.
ID notes: The floating leaves are "supported by [a] slender to bulbous float at mid petiole." (Hellquist and Graham 2021).
Origin/Endemic status: Eurasia
Other Comments: This species is becoming a seriously problematic invasive aquatic plant in the northeastern US and portions of the eastern Great Lakes.
Synonymy ⓘ: = C, F, FNA10, G, K4, NE, NY, Pa, Va; = n/a — Tat; < Trapa natans L. — Lin et al (2013). Basionym: Trapa natans L. 1753
Links to other floras: = Trapa natans - FNA10
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Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: OBL (taxonomic split from wetland indicator species)
- Eastern Mountains and Piedmont: OBL
- Northcentral & Northeast: OBL (taxonomic split from wetland indicator species)
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