Xanthosoma sagittifolium, the arrowleaf elephant ear, arrowleaf elephant's ear, malanga or american taro, is a species of tropical flowering plant in the genus xanthosoma, which produces an edible, starchy corm. cultivars with purple stems or leaves are also variously called blue taro, purplestem taro, purplestem tannia, and purple elephant's ear among others. taro is a different species that belongs to the genus colocasia.

Source: Wikipedia