Waterthread Pondweed

Other Common Names:

(Potamogeton diversifolius)


Waterthread pondweed’s stems are thread like. Submersed leaves are thin and straight. Floating leaves are leathery with a rounded base.


Waterthread pondweed’s roots come out of nodes. The stems are thread like, cylindrical, and branch horizontally from the roots. The submersed leaves are pale green, thin, and straight. They grow three-fourths of an inch to two and a half inches long and two-hundredths to six-hundredths of an inch wide. The midrib is usually bordered by one to four rows of cavities, and these submersed leaves grow from an immobile base, getting thinner toward the tips. Small leaves are delicately fibrous and grow from the base of the large leaf blade. Floating leaves can be oval or elliptical shaped, rounded at the base, and have a leathery texture. The leaf stalks are usually shorter than the blades. Floating leaves grow to one and a half inches long and three-fourths of an inch wide. Small leaves are free from the leaf stalks, delicately fibrous, and grow up to a quarter inch long. Submersed flower spikes are nearly spherical and bear just a few flowers. Emersed flower spikes can be two-tenths to eight-tenths of an inch long. The flowers are mostly immobile.


Waterthread pondweed can be found across the United States.


roots, seeds