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| Small free-floating plants with simple, thread-like or completely lacking roots. Leaves reduced to an oval or globe-like thallus or frond. | |
| Flora of North America: Discussion, key to genera (opens new window) | |
| Flower Formula: Sepals 0; Petals 0 | Glossary |
| Genus (Click for Taxon List) |
WI Taxa (map link) |
Photo | Genus Traits | Google Searches |
|---|---|---|---|---|
| Lemna
duckweed |
6 |  |
Single root present | Images Information |
| Spirodela
duckweed |
1 |  |
2 or more roots present | Images Information |
| Wolffia
water-meal |
3 |  |
No roots. | Images Information |