Plant Family: Water-Hyacinth Family, Pontedariaceae
Pickerel-weed (Pontederia cordata) has three inch long insect-pollinated purple to blue flower spikes. The large flower spikes, and arrowhead glossy leaves, make it one of the most attractive native emergent plants.
Pickerel-weed grows in small to large clumps in shallow marshes, and shallow portions of lakes, streams and rivers. The plants can spread rapidly through underground rhizomes. Many clumps are a single individual plant that spreads in this manner.