Hydropot
Blossom of the European sea can . It is one of the plants that have hydropots
In botany the gland-like cellular differentiation of the lower leaf epidermis of floating leaf plants , which serves to absorb water and the nutrient salts dissolved in the water, is called hydropot ( Greek for water drinker ) .
For example, the undersides of the leaves of many water lily plants are densely covered with macroscopically visible small dots. They are hydropots; The microscopic image shows that the cells are bulging and embedded in the water-side epidermis of the leaf.