zannichellia

Century Dictionary and Cyclopedia

1. n. A genus of plants, of the order Naiadaceæ, type of tribe Zannichellieæ. It is characterized by the absence of a perianth, by a single stamen, with slender fllament, and slightly curved carpels. The only species (by some considered as forming 9 species), Z. palustris, is a native of brackish ditches and salt water throughout the world. It is a submerged slender aquatic with a filiform creeping stem, the capillary branches becoming twisted into matted floating masses. The leaves are chiefly opposite, linear or filiform; the flowers are minute, at first terminal, but becoming axillary. See horned pondweed, under pondweed.

WordNet 3.0

1. n. horned pondweed: completely submerged herbs; in some classifications included in Potamogetonaceae