! Hunting & Fishing Licenses | Boat Registration Renewal
 

Giant Duckweed

Scientific Name: Spirodela polyrhiza 
 
Distinguishing Characteristics:
Tiny floating plant of 2 to 4 joined fronds that are usually more than 1/4 - inch wide; most fronds have a tiny red dot on one end; fronds egg-shaped to nearly round.
Two or more roots dangle beneath each leaf frond.
Forms layer on surface that is at the will of the wind; may cover an entire pond if conditions are calm; heavy infestations can shade sunlight required for oxygen synthesis and fish productivity. Often found in association with small duckweed.
Spirodela polyrhiza taken by Graves Lovell

Official Web site of Alabama Department of Conservation and Natural Resources
©2008 Alabama Department of Conservation and Natural Resources   |   64 N. Union Street, Suite 468 - Montgomery, Alabama 36130