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Lemnaceae
- family of small free-floating thalloid plants  
Lemna
- minute aquatic herbs floating on or below the water surface of still water consisting of a leaflike frond or plant body and single root  
Lesser Duckweed
- of temperate regions except eastern Asia and Australia  
- of temperate regions except eastern Asia and Australia
Lemna Minor
- of temperate regions except eastern Asia and Australia  
Lemna Trisulca
- cosmopolitan in temperate regions except North America  
Life-Of-Man
- unarmed woody rhizomatous perennial plant distinguished from wild sarsaparilla by more aromatic roots and panicled umbels; southeastern North America to Mexico  
Longroot
- deep-rooted perennial of southeastern United States  
Longroots
- deep-rooted perennial of southeastern United States  
Lychnis
- mostly perennial herbs with sticky stems that catch insects; widespread in north temperate zone  
Lychnis Flos-Cuculi
- common perennial native to Europe and western Asia having usually pink flowers with ragged petals