05/29/2009 04:19 PM
Elms are deciduous and semi-deciduous trees comprising the genus Ulmus, family Ulmaceae. Elms first appeared in the Miocene period about 40 million years ago. Originating in central Asia, the tree flourished and established itself over most of the Northern Hemisphere, reaching the Equator in Indonesia. During the 19th century, many species and cultivars were also introduced as ornamentals to parts of the Southern Hemisphere, notably Australasia.