Pistia stratiotes L. Royle (ITIS)
Water lettuce, tropical duckweed
Unknown, possibly South America, Africa, or the U.S. (Dray et al. 1988)
First described in Florida in 1765; experts disagree as to whether water lettuce is native to the U.S. (Ramey 2001)
Unknown (possibly native to the U.S., or it may have arrived in ballast water) (Ramey 2001)
Grows into dense mats that clog waterways (Ramey 2001)
Distribution / Maps / Survey Status
Google. YouTube; University of Florida. IFAS. Center for Aquatic and Invasive Plants.
The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Water Lettuce.
Ontario's Invading Species Awareness Program (Canada).
Texas Commission on Environmental Quality, Galveston Bay Estuary Program; Houston Advanced Research Center (HARC).
Centre for Invasive Species Solutions; Atlas of Living Australia; Australian Government. Department of Agriculture, Water and the Environment.
USDA. ARS. National Genetic Resources Program. GRIN-Global.
Business Queensland (Australia).
Australian Centre for International Agricultural Research. PestNet.
State and Local Government
Pennsylvania Department of Conservation and Natural Resources.
See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands
Wisconsin Department of Natural Resources.
University of California. Agriculture and Natural Resources. California Aquatic Invasive Species.
University of Florida. IFAS. Center for Aquatic and Invasive Plants.
Dray, F.A., C.R. Thompson, D.H Habeck, J.K. Balciunas, and T.D. Center. 1988. A survey of the fauna associated with Pistia stratiotes L. (waterlettuce) in Florida (Technical Report A-88-6). Jacksonville, Fla.: U.S. Army Corps of Engineers Aquatic Plant Control Research Program.
Integrated Taxonomic Information System. Pistia stratiotes. [Accessed Sep 10, 2014].
Ramey, V. 2001. Water lettuce. University of Florida, IFAS Extension, Center for Aquatic and Invasive Plants.