The finding that damage to the plant tissues was necessary to release the allergen was confirmed. These findings suggest that such lactones may be the allergens of Magnolia . Parthenolide is also derived from Michelia champaca of this family. This species is used in herbal medicine. Michelia Fifty species are found in tropical Asia and China.
Several species provide useful timber.
In one of five cases the leaf produced a positive patch test reaction. Elizabeth, N.J Published by the author. The Merck Index. An Encyclopedia of Chemicals, Drugs, and Biologicals. V.C.G. Gatrell, Government Printer.