- Pistia stratiotes is a sprawling, semi-woody shrub that invades wetlands in Florida. The green stems are up to 15 ft. (4.6 m) long and prickly.
- Leaves are flashy and arranged in a rosette. They measure 0.75-6 in. (2-15 cm) in length. The leaves are green to grayish-green, and have dense white hairs and parallel veins on their surface. As its common name indicates, the plant resembles a floating head of lettuce.
- This plant flowers year-round in southern Florida, but peaks during summer and early autumn.
- The hydrosoil under a Pistia stratiotes infestation was shown to hold 4,196 seeds/m2. Mature seeds in fruits had an 84% germination rate.
- Ecological Threat
- Pistia stratiotes, forms extensive mats that can block navigational channels, impede water flow in irrigation and flood control canals, and disrupt submersed animal and plant communities (Sculthorpe, 1967; Attionu, 1976; Bruner, 1982; Sharma, 1984). Pistia stratiotes is among the world’s worst weeds (Holm et al., 1977). It has been placed on prohibited plant lists in Florida (FDEP, 2000), Louisiana (LDWF, 2000), Mississippi (MDAC, 1997), and Texas (TPWD, 2000), and is considered a noxious species (an invasive species of concern, but not regulated) in South Carolina (SCDNR, 2000) and Delaware (DDFW, 2000).
- Biological Control of Invasive Plants in the Eastern United States - USDA Forest Service
- Invasive Plant Atlas of New England - University of Connecticut
- Identification and Biology of Non-Native Plants in Florida's Natural Areas - University of Florida
- Global Invasive Species Database - Invasive Species Specialist Group
- Images, Video and Information - University of Florida - Center for Aquatic and Invasive Plants
- Fact Sheet - Ontarios Invading Species Awareness Program
Image Sets View other image sets:
EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Most Troublesome / Most Common Agricultural Weed List
This map identifies those states that consider this species either most troublesome or most common in at least one commodity. For more information, visit the MTMC project page.
|No Data for this state|
|Troublesome or Common weed in one or more crops|
Invasive Listing Sources
- Alabama Invasive Plant Council - Watch list A
- Alabama Noxious Weeds - Class C Noxious Weed
- Alachua County Cogongrass Initiative
- Apalachicola Invasive Working Group
- California Noxious Weeds
- Colorado Noxious Weeds
- Connecticut Invasive Plant List
- EDDMapS Ontario
- Faith Campbell, 1998
- Florida Exotic Pest Plant Council - Category I
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- South Carolina Noxious Weeds
- Texas Noxious Weeds
- Treasure Coast Cooperative Invasive Species Mgmt. Area - EARLY DRAFT
- WeedUS - Database of Plants Invading Natural Areas in the United States
Other System LinksPlants: PIST2
NPDN Pest: PAKAEBA
NPDN Host: 36229
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|