Alternanthera philoxeroides (Mart.) Griseb. (ITIS)
Alligatorweed, alligator weed, pig weed
Achyranthes philoxeroides (ITIS)
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)
Southeastern U.S., California
Distribution / Maps / Survey Status
The section below contains highly relevant resources for this species, organized by source.
State and Local Government
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.