Pontederia crassipes, commonly called water hyacinth, is a floating perennial aquatic plant in the family Pontederiaceae. The genus name Pontederia commemorates the Italian botanist Giulio Pontedera, and the species epithet crassipes comes from Latin meaning “thick-stalked,” referring to its bulbous leaf petioles that help the plant float. It is native to the Amazon basin of South America but now widespread as an invasive species in tropical and subtropical regions worldwide

Historically, water hyacinth was not widely consumed due to its fibrous texture and potential for heavy-metal uptake from polluted waters, but some local communities in Asia and Africa incorporated it into subsistence practices. In regions of Southeast Asia, its young leaves and petioles were occasionally eaten as boiled greens or used in animal fodder. In Africa, dried and ground plant material was sometimes incorporated into flour blends during famine periods. Beyond food, the plant was traditionally valued for medicinal purposes, such as poultices for skin conditions, and for practical uses including weaving, fertilizer, and compost. In modern contexts, water hyacinth is more commonly used for bioremediation and as a livestock feed additive rather than direct human food, though experimental studies have explored its nutritional potential. Its role in wetland ecology is complex: it provides habitat for some aquatic species, but its invasiveness makes it a major environmental challenge by choking waterways and depleting oxygen levels.