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Cinchona, also known as quina, is the collective name for the genus Cinchona, which consists of approximately 38 species in the Rubiaceae family. These trees and shrubs originate from the tropical mountain forests of the Andes in Western South America. Cinchona is primarily known for its medicinal significance: the bark contains quinine and other alkaloids that have traditionally been used in the treatment of malaria.

The yam root is one of the oldest cultivated crops in the world. In Asia, the plant was already being cultivated around 3000 BC. In China, it is known as Chinese yam, and in Japan as nagaimo. In Africa, too, yam still forms an important part of the daily diet today.
The domestication of yam took place independently on different continents. The tubers are highly variable in shape and size. They can be round, elongated, or highly branched. Depending on the species, mature tubers can reach a weight of approximately 1 kilogram to more than 50 kilograms. The flesh also shows variation in color and can be white, yellow, or pink.