cinnamon vine: hardy Chinese vine naturalized in United States and cultivated as an ornamental climber for its glossy heart-shaped cinnamon-scented leaves and in the tropics for its edible tubers
yam: any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots
citric acid: a weak water-soluble acid found in many fruits (especially citrus fruits); used as a flavoring agent