Lemna minor

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Less than 1/4 inch across, these flat, rounded plants are usually found attached in groups of 3-4. They occur in huge quantities and then are often referred to as “green scum.” They have long roots dangling below (B,C); their undersides are usually green as well. Shown (A) with the much smaller Watermeal (Wolffia species) and in (C) with the larger and more uncommon Greater Duckweed (Spirodela polyrrhiza). Identification: By far the most common of our duckweeds. Lesser duckweed is about half the size of Greater Duckweed (Spirodela polyrrhiza).

In stagnant water from April on. In Fontenelle Forest, common in water along Stream Trail. At Neale Woods, common in Rock Creek.


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