a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth

family of small free-floating thalloid plants

of temperate regions except eastern Asia and Australia

cosmopolitan in temperate regions except North America

cosmopolitan except South America and New Zealand and some oceanic islands

any of various aquatic plants of the genus Wolffia; throughout warmer regions of the world

having narrow flat sickle-shaped submerged fronds; North America

family of small free-floating thalloid plants