Plants that live in water are known as hydrophytes.
Hydrilla, Valisineria, and others remain completely submerged in the water, while trap, lotus, and others have most of their body parts submerged.
Other important water plants include water lilies, sedges, and crowfoots.
Many hydrophytes, such as the spiked watermilfoil is totally submerged in water, and absorb water and gases throughout their entire surface. It has no stomata.
Many hydrophytes have less mechanical and vascular tissue.
Partially submerged hydrophytes feature floating leaves with stomata, similar to land plants, through which gases can be transferred.