Trapa

File:Trapa natans flower.jpg - Wikipedia

Trapa natans Lower Hudson Partnership for Regional Invasive Species Management.

water chestnut (Trapa bispinosa var. iinumai) - Species Profile

Trapa bispinosa Early Detection and Eradication

Trapa natans (water-chestnut): Go Botany

Digital Atlas of the Virginia Flora

欧菱 Trapa natans

Water caltrop: growing Trapa natans - Plantura

TRAPA - Chocolates desde 1891

Trapa natans L., Plants of the World Online

Trapa bicornis - Useful Tropical Plants