Myriophyllum heterophyllum, Variable Watermilfoil


Invasive Species: Myriophyllum heterophyllum, Variable Watermilfoil

Variable watermilfoil is an invasive¬†perennial aquatic herb that has leaves of two noticeably different forms. The submerged leaves are finely dissected, whorled, reddish/greenish-brown, and 1/2 to 2 1/2 in. (1.3 to 6.4 …

Myriophyllum aquaticum, Parrotfeather Watermilfoil


Invasive Species: Myriophyllum aquaticum, Parrotfeather Watermilfoil

Parrotfeather watermilfoil is an herbaceous, rooted, submerged/emergent plant that invades aquatic habitats throughout much of the United States. Stems are stout and blue-green in color. Leaves are abundant, whorled, pinnately compound, and finely …

Hydrilla verticillata, hydrilla


Invasive Species: Hydrilla verticillata, Hydrilla

Hydrilla is a submersed, rooted invasive aquatic plant that can grow in water to depths of 20 ft. (6.1 m). Plants can survive in depths to 40 ft. (12 m) in nonturbid water. Leaves …