The Banana Shrub or Port Wine Magnolia (Michelia figo) is an evergreen tree growing to 3-4 m tall. It is native to China.Initially described as by Portuguese missionary and naturalist João de Loureiro as Liriodendron figo, it was reclassified as Michelia figo by German botanist Curt Polycarp Joachim Sprengel. In 2006, a cladistic analysis of the genus Michelia found them to lie within the genus Magnolia.
The methanolic extract of leaves of Michelia figo Spreng. (Magnoliaceae), as well as several purified fractions, showed a concentration-dependent vasorelaxing effect on aortic rings endothelium-deprived and pre-contracted by norepinephrine (NE). For further pharmacological investigation on the mechanism of action, the fraction S4 was selected, since it showed the best vasodilator properties. The pharmacological effect was not produced through the stimulation of cyclooxygenase, adenyl cyclase, or guanylyl cyclase, since selective inhibitors did not prevent the fraction S4-induced effects.