Giant salvinia
Plant
Salvinia molesta, commonly known as giant salvinia, or as kariba weed after it infested a large portion of Lake Kariba between Zimbabwe and Zambia, is an aquatic fern, native to south-eastern Brazil. Wikipedia
Scientific name: Salvinia molesta
Class: Polypodiopsida
Genus: Salvinia
Clade: Tracheophytes
Division: Polypodiophyta
Family: Salviniaceae
Kingdom: Plantae