Editing Elm (section)

==Description==
The genus is [[hermaphroditic]], having [[apetalous]] [[perfect flower]]s which are wind-pollinated. Elm [[leaves]] are alternate, with simple, single- or, most commonly, [[leaf shape|doubly serrate]] margins, usually asymmetric at the base and [[acuminate]] at the [[wikt:apex|apex]]. The fruit is a round wind-dispersed [[samara (fruit)|samara]] flushed with [[chlorophyll]], facilitating photosynthesis before the leaves emerge.<ref name="Heybroek">Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). ''Iep of olm, karakterboom van de Lage Landen'' (:Elm, a tree with character of the Low Countries). KNNV, Uitgeverij. {{ISBN|9789050112819}}</ref> The samarae are very light, those of British elms numbering around 50,000 to the [[pound (weight)|pound]] (454 [[gram|g]]).<ref name=Edlin>Edlin, H. L. (1947). ''British Woodland Trees'',&nbsp;p.26. 3rd. edition. London: B. T. Batsford Ltd.</ref> (Very rarely anomalous samarae occur with more than two wings.<ref>[https://www.biodiversitylibrary.org/page/53908110#page/342/mode/1up J.-F. Leroy, 'Note sur quelques anomalies des fleurs et des fruits dans le genre ''Ulmus'' ', ''Bulletin de Muséum national d'histoire naturelle'', 2nd Ser., Vol.17, p.326]</ref>) All species are tolerant of a wide range of soils and [[pH]] levels but, with few exceptions, demand good drainage. The elm tree can grow to great height, the [[Ulmus americana|American elm]] in excess of {{convert|30|m|ft|abbr=off}},<ref>Neeland, R.W. ''Important Forest Trees of the Eastern United States'', United States Department of Agriculture Forest Service. p.68.</ref> often with a forked trunk creating a vase profile.
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Image: Sapporo Autumn Gold, Florence.jpg|'Sapporo Autumn Gold', Antella, [[Florence]]
Image:Ulmus glabra.jpg|Wych elm (''Ulmus glabra'') leaves and seeds
Image:Ulmus_rubra_leaf.jpg|Asymmetry of leaf, slippery elm ''U. rubra''
Image:Mature Ulmus rubra bark.jpg|Mature bark, slippery elm ''U. rubra''
Image:Columella flowers.jpg|Flowers of the hybrid elm cultivar 'Columella'
Image:Winged_Elm_Ulmus_alata_2009-05-10.jpg|Corky wings, Cedar elm, ''U. crassifolia''
Image:laciniata samara.jpg|''U. laciniata'' samara
Image:Lovers' Elm, Gwynne estate, Dufferin Street.jpg|''U. americana'', [[Dufferin Street|Dufferin St.]], Toronto, c. 1914
File:榔榆 Ulmus parvifolia 20210908101019 02.jpg|''[[Ulmus parvifolia]]'' bark
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