Birch Bark Cherry (Tibetan cherry). A wild species native to the high mountains of western China, including Tibet, botanically Prunus serrula. The small flowers are greenish white, but the exfoliating, shiny, mahogany-brown bark is its most distinctive feature. The species is unfortunately highly susceptible to bacterial canker, which can easily ruin the bark effect. Other ornamental cherries are sometimes grafted on the stems of birch bark cherry, but the effect is seldom pleasing in the long run.\