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 (Buckingham 1996)
Possibly introduced through ballast water (Buckingham 1996)
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
Smithsonian Institution. Smithsonian Marine Station at Fort Pierce.
Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab.
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.
Buckingham, Gary R. 1996. Biological control of alligatorweed, Alternanthera philoxeroides, the world's first aquatic weed success story. Castanea 61(3): 232–243.
Integrated Taxonomic Information System. Alternanthera philoxeroides. [Accessed Sep 10, 2014].
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.