Local name = Alligator-weed. Problematic weed in damp areas and ponds. In www.texasinvasives.org
綠莧，野莧 Slender amaranth (Amaranthus viridis)
The Amaranthaceae, the Amaranth family, represent the most species-rich lineage within the flowering plant order of Caryophyllales. Now including the former goosefoot family (Chenopodiaceae), the extended family contains approximately 180 genera and 2,500 species.