Potamogetonaceae or pondweed family
GROWTH HABIT: Commonly found in alkaline and high nutrient waters. It tolerates low light and low water temperatures. Preferring soft substrate and shallow water depths. Spread by winter buds (turions). New plants form under the ice in winter, making it one of the first nuisance aquatic plants to emerge in the spring. The low water temperature tolerance allows for it to out compete native plants in the spring. In mid-summer, when most aquatic plants are growing, curly-leaf pondweed is dying off. Plant die-offs may result in a critical loss of dissolved oxygen.
LEAVES: Sessile, stiff, oblong with serrations on edges. 1.5- 4 inches long and translucent. Resembles lasagna noodles
STEMS: Flat, reddish-brown and grows 1 to 3 feet long.
FLOWERS: Cream to brown, inconspicuous, bloom on short emergent spike with up to 10 flowers per spike.
ROOTS: Creeping rhizomes
SEEDS: Small, flat, with pointed beak, 1/5 in. long. Seeds are not a major form of spread. Spreads through burr-like winter buds or turions, which are moved among waterways.
REPRODUCES: Vegetative reproduction through turions.
HABITAT: Once a desirable aquarium plant by hobbyists in the mid 1880s. Commonly found in high nutrient waters, in shallow depths. It tolerates low light and low water temperatures.
"Reported in all states but Maine."