Science, Tech, Math › Animals and Nature Identify the Elms Trees in the Elm Family - Ulmaceae Share Flipboard Email Print DEA / RANDOM/De Agostini Picture Library/Getty Images Animals and Nature Forestry Tree Identification Basics Arboriculture Tree Structure & Physiology Growing Trees Conifer Species Individual Hardwood Species Pests & Wildfires Planting & Reforestation Animals and Zoology Insects Marine Life Dinosaurs Evolution by Steve Nix Updated March 17, 2017 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, including North America. Eight elm species are endemic to North America, and a smaller number to Europe; the greatest diversity is found in China. The Common North American Elm Species American elm rock elm slippery elm Leaves: alternate, asymmetrical, uneven at base, toothed.Fruit: a drupe or winged key.ash | beech | basswood | birch | black cherry | black walnut/butternut | cottonwood | elm | hackberry | hickory | holly | locust | magnolia | maple | oak | poplar | red alder | royal paulownia | sassafras | sweetgum | sycamore | tupelo | willow | yellow-poplarID Glossary Continue Reading