Echinodorus

About

Echinodorus, commonly known as burhead, is a genus of plant in the family Alismataceae. It contains a single species, Echinodorus berteroi, which is native to the Americas. The name is derived from Ancient Greek echius 'rough husk', and doros 'leathern bottle', alluding to ovaries, which in some species are armed with persistent styles, forming prickly head of fruit.

Summary from Wikipedia