Zannichellia palustris Click in the blue box to get a closer look. Widely distributed throughout the Chesapeake bay in fresh to brackish waters. Two distinctly different growth forms allow this species to inhabit both low and high energy areas. Long linear threadlike opposite leaves or arranged in whorls.
Horned pondweed is anchored by thin rhizomes and tendril-like roots.
Horned pondweed occurs early in the spring and begins to dies off as water temperatures warm in early summer. Occasionally, a second growth cycle will occur in the fall. If you don't think your plant is represented above try going back a level and choosing again.