This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
It is obtained from the leaves of Aloysia citriodora Orteg. (verbena triphylla Herit.), indigenous to Peru. By distillation with water a volatile oil is obtained, the aroma of which resembles that of lemon-grass oil (page 698) in a high degree; the latter is therefore not unfrequently also called verbena oil. Verbena oil may sometimes be used where lemon or orange oils find application. As a new souroe of verbena oil is mentioned the Eucalyptus staigeriana tree, known as the lemon-scented iron bark, a native of Queensland. Its leaves possess an odor exactly like that of the lemon-scented verbena, and the oil they yield is equal in fragrance to that of the so-called oil of verbena of commerce.