Submergent plant
Encyclopedia
A submergent plant or submergent vegetation is a plant
Plant
Plants are living organisms belonging to the kingdom Plantae. Precise definitions of the kingdom vary, but as the term is used here, plants include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The group is also called green plants or...

 that is completely beneath the surface of water. Most submergent plants are firmly rooted in the soil. Examples include elodea
Elodea
Elodea is a genus of aquatic plants often called the waterweeds. Elodea is native to North America and is also widely used as aquarium vegetation. The introduction of some species of Elodea into waterways in parts of Europe, Australia, Africa, Asia, and New Zealand has created a significant problem...

 (Elodea canadensis) and eelgrass
Wild celery
Wild celery is a plant in the family Hydrocharitaceae . Contrary to the implications of its name, wild celery bears little to no resemblance to the celery used as a vegetable. Wild celery grows under water and is consumed by various animals, including the canvasback...

(Vallisneria americana).
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