Duckweeds are common plants in Florida. Although very small, they are nonetheless sometimes quite noticeable, as when they cover a pond with dense masses.
Click on the picture above to compare the duckweeds. Note the centimeter-measure in the picture, remembering that 2.5 cm equals an inch. These are very small flowering plants indeed; in fact, water meal (Wolffia spp.), at 1 to 1.5 mm long, is the smallest flowering plant on earth!
Also see the individual plant pages for the duckweeds: