Original sentence: In Mexico, 'agua de Jamaica' (water of roselle) is most often homemade.It is prepared by boiling the dried flowers of the Jamaica plant in water for 8 to 10 minutes (or until the water turns red), then adding sugar
Edited sentence: For this same reason, it is widely, but erroneously, believed that the drink is made from the flowers of a non-existent "Jamaica plant".In Mexico, 'agua de Flor de Jamaica' (water flavored with roselle) frequently called "agua de Jamaica" is most often homemade.It is prepared by boiling dried calyces of the Jamaica plant in water for 8 to 10 minutes (or until the water turns red), then adding sugar.The latter name, "Agua de Jamaica" is technically incorrect though in common usage in Mexican Spanish, since the name of the plant is "Flower of Jamaica" (Flor de Jamaica), not "Jamaica", as many untrained consumers mistake the calyces of the plant to be dried flowers