Salvinia - minima
Common Salvinia is native to South America. It is a small free-floating
plant that grows in clusters and develops into dense, floating mats or
colonies in quiet water, undisturbed by wave action. The floating leaves
of salvinia are more or less round (1/2 to 3/4 inch) with a distinct
midrib along which the leaf may fold forming a cup-shaped appearance.
Salvinias have stiff leaf hairs on the upper surface of the leaves. In
common salvinia the leaf hairs have a single stalk that divides into
four separate branches. Underwater the leaves are modified into small
root-like structures. The entire plant is only about 1 inch in depth.
Salvinias are ferns and have no flower.