Ulmus ‘Frontier’ Frontier elm

This tree, introduced by the U.S. National Arboretum in 1990, is a hybrid of Ulmus minor and U. parvifolia. It is highly resistant to Dutch elm disease, and has grown about 35 feet tall, with a spread of 15 feet. The small leaves turn an unusual red-purple in fall. Flowers are rarely seen and the tree does not produce seed. Stanford experimented with four of these trees around 2003 at the end of Escondido Road in front of Stern Hall; two were removed when the island was reconfigured.

Name derivation: Ulmus – classical Latin name for the elm.