White-flowered West Indian plant whose root yields arrowroot starch WordNet 3.0 & Open English WordNet

Maranta arundinacea, also known as arrowroot, maranta, West Indian arrowroot, obedience plant, Bermuda arrowroot, araru, araruta, ararao or hulankeeriya, is a large, perennial herb found in rainforest habitats of the Americas, but cultivated in tropical regions worldwide. Wikipedia

Called arrowroot, the traditional source of the starch Wikipedia Disambiguation

A starchy substance obtained from the rhizomes of an arrowroot plant used as a thickener. Wiktionary

Starchy substance. Wiktionary (translation)