*Detected in Michigan*
- Free-floating – forms a rosette of leaves that resembles an open head of lettuce
- Leaves are thick, ridged, rounded at the end, light green, and have short, white hairs
- Produces small, white to pale green flowers
- Many feathery roots dangle under the rosette
Troy Evans, Great Smoky Mountains National Park, Bugwood.org
Karen Brown, University of Florida, Bugwood.org
USDA APHIS PPQ - Oxford, North Carolina, USDA APHIS PPQ, Bugwood.org
Habitat: Water lettuce can be found in ponds, lakes, rivers, and streams.
Native Range: Uncertain – likely tropical or subtropical
U.S. Distribution: Water lettuce has been introduced to the south and western United States, as well as Ohio, New York, New Jersey, Maryland, Delaware and Michigan.
Local Concern: This freshwater perennial creates thick mats that reduce oxygen levels, block sunlight, and prevent growth of submerged vegetation. Mats interfere with recreation and can have a negative effect on fish and other aquatic species in an infested area.