European frog-bit is a free-floating aquatic plant that resembles a miniature water lily.

Leaves are thick, heart-shaped, 1 to 2 inches wide and smooth-edged with spongy, purplish-red undersides. Small, showy flowers are ½ inch across, appear singly and have three white petals and yellow centers.

Roots are 3 to 8 inches long and unbranched, dangling from the underside of each rosette of leaves. Plants form a thick mat with tangled roots and runners..

An extra-ordinary plant that resembles a floating pineapple top.

During the summer it floats half-submerged and produces small white flowers. Young plants are produced on wiry stems during summer.

Water chestnut is a rooted, floating plant that invades aquatic habitats. This rooted plant can grow in 12 to 15 feet of water.

Leaves are triangular in shape and strongly toothed. The rosette of floating leaves is connected to an inflated petiole, increasing buoyancy.

Small four-petaled flowers give way to the nut-like fruit. The fruit have four ½ inch sharp, barbed spines. It forms dense floating mats, often three layers deep, that restrict light availability, reduce the oxygen content, and displace other emergent and floating vegetation.