Description The genus is hermaphroditic, having apetalous perfect flowers which are wind-pollinated. 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.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. The samarae are very light, those of British elms numbering around 50,000 to the pound (454 g).Edlin, H. L. (1947). British Woodland Trees, p.26. 3rd. edition. London: B. T. Batsford Ltd. (Very rarely anomalous samarae occur with more than two wings.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) 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 American elm in excess of 30 m (100 ft),Neeland, R.W. Important Forest Trees of the Eastern United States, United States Department of Agriculture Forest Service. p.68. often with a forked trunk creating a vase profile.
Description The genus is hermaphroditic, having apetalous perfect flowers which are wind-pollinated. 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.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. The samarae are very light, those of British elms numbering around 50,000 to the pound (454 g).Edlin, H. L. (1947). British Woodland Trees, p.26. 3rd. edition. London: B. T. Batsford Ltd. (Very rarely anomalous samarae occur with more than two wings.J.-F. Leroy, 'Note sur quelques anomalies des fle?urs et des fruits dans le genre Ulmus ', Bulletin de Muséum national d'histoire naturelle, 2nd Ser., Vol.17, p.326) 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 American elm in excess of 30 m (100 ft),Neeland, R.W. Important Forest Trees of the Eastern United States, United States Department of Agriculture Forest Service. p.68. often with a forked trunk creating a vase profile.