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Elm leaves are alternate, with simple, single- or, most commonly, doubly serrate margins, usually asymmetric at the base and acuminate at the apex. The fruit is a round wind-dispersed samara flushed with chlorophyll , facilitating photosynthesis before the leaves emerge. [ 3 ]
Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, [a] is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can withstand low winter temperatures, but it is affected by Dutch elm disease.
Ulmus rubra, the slippery elm, is a species of elm native to eastern North America. Other common names include red elm , gray elm , soft elm , moose elm , and Indian elm . Description
The cedar elm is a medium to large deciduous tree growing to 24–27 m tall with a rounded crown. The leaves are small, 2.5–5 cm long by 1.3–2 cm broad, with an oblique base, and distinguish it from Ulmus serotina with which it readily hybridizes in the wild. Leaf fall is late, often in early winter.
Ulmus glabra, the wych elm or Scots elm, has the widest range of the European elm species, from Ireland eastwards to the Ural Mountains, and from the Arctic Circle south to the mountains of the Peloponnese and Sicily, where the species reaches its southern limit in Europe; [2] it is also found in Iran.
Ulmus serotina - September elm; Ulmus thomasii - rock elm, cork elm; Subgenus Ulmus. U. section Foliaceae. Ulmus castaneifolia - chestnut-leafed elm, multi-nerved elm; Ulmus changii - Hangzhou elm Ulmus changii var. changii; Ulmus changii var. kunmingensis; Ulmus chenmoui - Chenmou elm, Langya Mountain elm; Ulmus chumlia; Ulmus davidiana ...
Ulmus thomasii, the rock elm [3] or cork elm (or orme liège in Québec), is a deciduous tree native primarily to the Midwestern United States. The tree ranges from southern Ontario and Quebec , south to Tennessee , west to northeastern Kansas , and north to Minnesota .
Johnstown Elm in Johnstown, NY. 196 inch circumference, 85 feet tall, disease free in September, 2013. Largest elm in New York state, photo January 2012. (No longer standing as of October 2018.) The Johnstown Elm, in Johnstown, New York, as of September 2013 did not show any signs of Dutch elm disease. In October 2018 all that remained was a ...