Zannichellia palustris, also known as horned pondweed, is an aquatic plant species that belongs to the family Potamogetonaceae. This plant is commonly found in freshwater habitats such as lakes, rivers, and ponds. Some synonyms for Zannichellia palustris include Zannichellia obtusifolia, Zannichellia palustris var. obtusifolia, and Zannichellia pedicellata. These synonyms refer to variations of the plant's morphology or its geographical distribution. Despite the variations, the plant is known for its horn-shaped fruits and stem that can grow up to 70cm in length. Zannichellia palustris is an important part of these bodies of water as it provides food and shelter to various aquatic species.