Xanthosoma Lime Zinger, aka Xanthosoma aurea 'Lime Zinger’, or Lime Zinger Golden Elephant Ear, has large, chartreuse-yellow, heartshaped leaves. Xanthosoma, Colocasia and Alocasia are very similar, and are all nicknamed Elephant Ear, but Xanthosomas have a sagittate (arrow-shaped) leaf blade (there are a few exceptions to this) with a smooth, sometimes waxy upper surface and thick ribs on the lower surface, often quilted at the veins.