Elephant ear

 The large rounded tubers commonly sold are almost always Colocasia 
esculenta. In most cases the Xanthosomas are elongated and usually have 
pink colorations in or on the tubers. I have rarely seen Xanthosomas 
sold commercially, but more often they are sold as food in ethnic stores 
as malanga. Colocasias are usually sold as Taro or Dalo. One of the best 
ways to tell if it is a Xanthosoma is to see the color of the sap 
Xanthosomas usually have white sap they also have pink to  white spaths. 
Their is only one Colocasia I know of with a white spath and that is 
Colocasia gigantea.
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