Lesser Duckweed Lemna minor

Even with a short lifespan, 'Common Duckweed' spreads rapidly,  Its habit is to lay along the water surface with its extremities facing upwards.  Among the smallest flowering plants known, these tiny plants form a carpetlike cover.  Each plant consists of a single flat leaf that floats on the surface of still waters such as ponds and lakes.  

A sticky secretion from the pistol of the plants' flower attracts flies, mites, spiders, and bees.  Their contact with the substance leads to further pollination of the plant.

Although some consider its spreading nature as invasive, there are some benefits.  Waterways containing high amounts of phosphorus and nitrogen from agricultural runoff can be controlled by harvesting duckweed.  The plant helps remove these pollutants from the water.  

Insects, Diseases and Other Plant Problems:  Its spreading nature can become invasive.