U. x hollandica Australis is a little-known tree distinguished by its conspicuously and numerously veined leathery leaves. Reputedly endemic to south-eastern France, Switzerland and Italy, it was treated as U. montana (: glabra) var. australis Hort. by Loudon, who described it as having "rather small leaves and a more pendulous habit". Other authorities have considered it to be a variety of U. procera or U. minor.