| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|
| Araceae | Lemna aequinoctialis | Lesser Duckweed | Still to slowly moving waters of ponds, lakes, beaver ponds, and swamps. | Widespread worldwide, except in n. North America and n. Eurasia. | 
|
| Araceae | Lemna minor | Common Duckweed | Still to slowly moving waters of ponds, lakes, beaver ponds, and swamps. | Widespread in the Northern Hemisphere; scattered in the Southern Hemisphere, where perhaps in part introduced. | 
|
| Araceae | Lemna minuta | Least Duckweed | Quiet waters, seepages. | Widespread in North America, Central America, and South America; more local in Europe and Japan. | 
|
| Araceae | Lemna obscura | Little Duckweed | Still to slowly moving waters of ponds, lakes, beaver ponds, and swamps. | NY west to MN and NE, south to s. FL, TX, Mexico, and the Bahamas. | 
|
| Araceae | Lemna perpusilla | Tiny Duckweed | Still to slowly moving waters of ponds, lakes, beaver ponds, and swamps. | QC west to MN, south to NC, TN, and TX. | 
|
| Araceae | Lemna trisulca | Star Duckweed, Ivy-leaved Duckweed | Still to slowly moving waters of ponds, lakes, beaver ponds, and swamps, calcareous springs. | Widespread in the Northern Hemisphere; scattered in the Southern Hemisphere. | 
|
| Araceae | Lemna turionifera | Turion Duckweed, Red Duckweed | Mesotrophic to eutrophic, quiet waters. | Circumboreal, in North America from NL (Newfoundland) west to AK, south to c. PA (Rhoads & Klein 1993; Rhoads & Block 2007), WV, KY, n. AL (FNA), TX, NM, AZ, and CA. | 
|
| Araceae | Lemna valdiviana | Pale Duckweed | Still to slowly moving waters of ponds, lakes, beaver ponds, and swamps. | Widespread in North America, Central America, and South America. | 
|