Therefore, the utilization of orphan crops has become an effective ... Water caltrop (Trapa spp.) is a kind of typical orphan crop, which has been consciously collected and domesticated as early ...

Additionally, the water chestnuts discussed in this article are not to be confused with water caltrops (Trapa natans). The water caltrop is distinguishable from the water chestnut by its trapezoidal ...

Naturalistically carved with a lotus root, a water caltrop, and a leafy floral spray, all atop a large lotus leaf. 5.2cm (2in) long.