- a floating aquatic plant, Eichornia crassipes, of tropical lakes and rivers, that grows so prolifically it often hinders the passage of boats.
- a floating aquatic plant, Eichhornia crassipes, of tropical America, having showy bluish-purple flowers and swollen leafstalks: family Pontederiaceae. It forms dense masses in rivers, ponds, etc, and is a serious problem in the southern US, Australia, and parts of Africa
