These are large plants of Alocasia Zebrina.
 
This is a gorgeous indoor plant with striking stems. It has black and white markings on the stem which have earnt its name as 'Zebrina'.
 
It hase large striking dark green glossy leaves.
 
Likes the soil to be kept moist, but not too wet. If its too wet the plant could rot. Prefers a well lit spot, but not direct light.
 
can grow up to 3 feet high, but this will depend on the sze of the pot it is planted in.