Distribution: Native to Argentina, invasive species in Australia, China, New Zealand, Sri Lanka, Thailand, United States.
Image locations: Chiang Mai
Map info: Provinces are highlighted according to phytogeographical areas as used in the Flora of Thailand project.
Additional notes: When alligator weed invades waterways, it can reduce water flow and quality by preventing light penetration and oxygenation of the water. It can also reduce water bird and fish activity and cause the death of fish and native plants. Alligator weed mats create a favorable habitat for breeding mosquitoes.
Images of Alternanthera philoxeroides from Thailand.
Alternanthera philoxeroides, Muang Chiang Mai, August