Watermeal
As a group, watermeal has the distinction of being one of the world's smallest flowering plants. A member of the duckweed family, watermeal is a free-floating plant that is hardly visible to the naked eye. It is rootless and floats with only its dorsal surface breaking the water surface. Normally growing in association with other duckweeds, it is capable of survival in damp vegetation found along the edges of ponds or sloughs.