| Lemna | Lemna minor L. | common duckweed | ME | NH | VT | MA | CT | RI |
| Lemna perpusilla Torr. | minute duckweed | ME | VT | MA | CT | |||
| Lemna trisulca L. | star duckweed | ME | NH | VT | MA | CT | ||
| Lemna valdiviana Phil. | valdivia duckweed | ME | NH | VT | MA | CT | RI | |
| Spirodela | Spirodela polyrrhiza (L.) Schleid. | common duckweed | ME | NH | VT | MA | CT | RI |
| Wolffia | Wolffia braziliensis Weddell | Brazilian watermeal | ME | VT | MA | CT | ||
| Wolffia columbiana Karst. | Columbian watermeal | ME | NH | VT | MA | CT | ||
| Wolffiella | Wolffiella gladiata (Hegelm.) Hegelm. | Florida mudmidget | MA |
Last Update: 1/4/97
Name: Ray Phillips
Email: rbphilli@Colby.edu