are tropical plants with large food reserve in their under- ground tubers and comprise of various species that originated from Southeast Asia, West Africa, East Africa, Brazil, and Guyana. The main species are Dioscorea alata (greater or water yam), Dioscorea cayenensis (yellow guinea yam), ...
Mangoes, oranges, lemons, and grapefruits are grown widely throughout tropical and subtropical environments in South America. While their origin is much disputed, coconuts are common in most tropical coastal areas in the region. Among the cereals, rice, which was introduced from Asia, has become...