water hyacinth: a tropical floating aquatic plant having spikes of large blue flowers; troublesome in clogging waterways especially in southern United States
aquatic plant: 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
m3: a measure of the money supply; M2 plus deposits at institutions that are not banks (such as savings and loan associations)