Colocasia is a genus of six to eight species of flowering plants in the family Araceae, native to tropical Polynesia and southeastern Asia (Wagner, Herbst, and Sohmer, 1999). Common name "Elephant-ear", or "Taro" this name also used for some other large-leaved genera in the Araceae, notably Xanthosoma and Caladium.
They are herbaceous perennial plants with a large rhizome on or just below the ground surface. The leaves are large to very large, 20-150 cm long, with a sagittate shape. The elephant's-ear plant gets its name from the the leaves, which are shaped like a large ear or shield.