Lemon basil (Ocimum × citriodorum Vis.), or maeng-lak in Thai, is a member of the
Lamiaceae (Labiatae) family that contains about 65 species of annual and perennial herbs
and shrubs indigenous to the tropical and subtropical zones of Asia, Africa and South
America. This herbaceous plant is largely cultivated in northeastern Africa and southern Asia
and considered to be a natural hybrid between Ocimum basilicum and Ocimum
americanum. Besides, it is one of the most economical important spices and medicinal herbs
in Ocimum section on account of its strong lemon fragrance used in cuisine, effective
essential oils against various pathogens and high antioxidant content and capability [1]-[6].