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Lemna minor L. Lemna cyclostasa Elliott ex Schleid. Lemna minima Chevall. ex Schleid. Lemna cyclostasa Elliot ex Schleid. Common duckweed
Common duckweed is native to Asia, Africa, Europe, and North America. Lemna means “water-plant” and “minor” means “lesser”—lesser because there is a similar-appearing plant in a different genus and with larger leaves, greater duckweed. Identification: Duckweed forms a nearly continuous mat of tiny green leaves just below the surface of freshwater ponds and slow-moving streams. The leaves are so small that colonies resemble algae or “pond scum” from a distance. Each leaf is oval, ¹/₃₂-¼" (1-8 mm) × ¹/₃₂-⅛" (), equipped with tiny air sacs for flotation. Flowers are rare and nearly invisible at about ¹/₃₂" (1 mm) in diameter. Fish and birds benefit from its relatively high fat and protein levels: “duckweed” is named for ducks’ preference for this food. Online References:
Lemna minor on Lemna minor on Wayne's Word Lemna minor on Wikipedia Lemna minor at the Lady Bird Johnson Wildflower Center Lemna minor on eFloras
4/7/2010 · Nashua River Rail Trail, Groton, Massachusetts
8/13/2010 Lemna minor description by Thomas H. Kent, last updated 25 May 2020.
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8/30/2010 · Old RR bed near Wilkins Farm, Pepperell, Massachusetts
8/30/2010 · Old RR bed near Wilkins Farm, Pepperell, Massachusetts
6/22/2017 · Garden in the Woods, Framingham, Massachusetts
7/23/2010 · Nashua River Boat Ramp on Rte 119, Groton, Massachusetts Range: Zones 4-10:
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ID is uncertain 
