The kaffi r lime leaf, or Citrus hystrix, is part of the Rutaceae family. It is known
by various different names, the etymology of which is discussed in this chapter. The areas
and systems of cultivation, diseases and pest control, production technology and marketing
of kaffi r lime leaves are also introduced in this chapter. Research methods for the analysis
of the chemical composition of essential oils or extracts from the kaffi r lime leaf are
reviewed and discussed together with their biological activities. Finally, the uses of fresh
leaves and their essential oils in the food and cosmetics industries are considered.