Pondweed

Pondweed refers to many species and genera of aquatic plants and green algae:
 * Potamogeton, a diverse and worldwide genus
 * Elodea, found in North America
 * Aponogeton, in Africa, Asia and Australasia
 * Groenlandia, a genus of aquatic plants
 * Stuckenia, a genus of aquatic plants
 * Charales, an order of green algae