Elodea << uh LOH dee uh >>, also called waterweed, is a group of plants that grow submerged in water. Elodea’s branching stems are densely covered with leaves that become even more crowded toward the tip. These plants are commonly used in aquariums to keep the oxygen balance in the water. They are also used to demonstrate that oxygen is one of the products of photosynthesis (see Photosynthesis). When elodea is exposed to light, oxygen bubbles appear around the leaves.
