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Further information about Elm

: Elms are deciduous and semi-deciduous trees comprising the genus "Ulmus", family Ulmaceae, found throughout the Northern Hemisphere from Siberia to Indonesia, Mexico to Japan. Many species and cultivars have also been introduced as ornamentals to parts of the Southern Hemisphere, notably Australasia. Elms have alternate, simple, single- or doubly-serrate leaves, usually asymmetric at the base and acuminate at the apex. They are hermaphroditic, having perfect flowers which, being wind-pollinated, are without petals. The fruit is a round wind-dispersed samara. All species are tolerant of a wide range of soils and pH levels but, with one exception (the European White Elm "U. laevis"), demand good drainage. The other genera of the Ulmaceae are "Zelkova" (Zelkova) and "Planera" (Water Elm). "Celtis" (Hackberry or Nettle Tree), formerly included in the Ulmaceae, is now included in the family Cannabaceae. Species, varieties and hybrids: There are approximately 30 to 40 species of elm; the ... Read more about Elm on Wikipedia

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