https://research.tudelft.nl/en/publications/bioavailability-and-accumulation-of-lanthanides-in-duckweeds-lemn-2/
Bioavailability and accumulation of lanthanides in duckweeds (Lemnaceae) - TU Delft Research Portal
https://weedid.missouri.edu/weedinfo.cfm?weed_id=154
Duckweeds // Mizzou WeedID
Weed ID Guide, Weed Science Program
mizzou