Hydrilla is the most feared invasive weed species to enter the United States and recently Indiana. Introduced as an aquarium plant from the warm waters of Asia, Europe and Africa. Able to lay dormant in sediment for several years it is the greatest threat to US waterways.
Small, strap-like leaves (1-inch long) in whorls of 3 to 8 around the stem.
Leaf margins are serrated and rough to the touch; sometimes 2 to 4 small barbs or spines on underside midrib of the leaf. Resembles Elodea and Egeria which are smooth to the touch.
Forms very dense mats reaching the surface and choking out native species.
Please report this plant so a long term chemical control program can be designed.