Colocasia spp. always distribute in fresh water wetland areas of Thailand. Leaf stalk, young leaf and tuber are used for vegetable and starch in local dish and industrial food.
Colocasia in Thailand http://aroidsthailand.myspecies.info/taxonomy/term/100
You can see taxonomic name and link of each species to the website http://www.aroid.org and http://apps.kew.org by clicking on species photograph.