Alternanthera philoxeroides (Mart.) Griseb. (ITIS)
Achyranthes philoxeroides (ITIS)
Alligatorweed, alligator weed, pig weed
South America (Spencer and Coulson 1976)
First reported in Alabama in 1897 (Masterson 2007)
Probably introduced through ballast water (Masterson 2007)
Forms dense mats that crowd out native species and impede recreational activities such as boating, swimming, and fishing (Texas Invasives 2007)
Distribution / Maps / Survey Status
The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Alligatorweed.
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.
Designated Weed of National Significance
USDA. ARS. National Genetic Resources Program. GRIN-Global.
Business Queensland (Australia).
State and Local Government
Mississippi State University. Geosystems Research Institute.
See also: Species Factsheets for more fact sheets
University of Florida. IFAS. Center for Aquatic and Invasive Plants.
Integrated Taxonomic Information System. Alternanthera philoxeroides. [Accessed Sep 10, 2014].
Masterson, J. 2007. Alternanthera philoxeroides. In: Indian River Lagoon Species Inventory. Smithsonian Marine Station.
Spencer, N.R. and J.R. Coulson. 1976. The biological control of alligatorweed, Alternanthera philoxeroides, in the Unites States of America. Aquatic Botany 2:177-190.
Texas Invasives Database. 2007. Alternanthera philoxeroides.