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Siberian elm - Invasive species: Minnesota DNR <br />Page 1 of 2 <br />1 - �'�,��� � = t,-��.•�' <br />� � ��� <br />� , � � � r ., � �� � �� � � ;� Enter Keywords search <br />. :����' �� �. . <br />, �� ,,, r � <br />.. ... . ... , <br />_r� I I,ist � Site Map � Contact the D� l_Z ;`,..;;`� `����,�, :' `: ����,; ..�_oom � Events & Seasons <br />> MN DNR Home > Natural resources > Invasive species > Invasive <br />terrestrial plants > <br />Siberian elm (Ulmus pumila) <br />Description: <br />Appearance: Deciduous tree, 30 - 60' high with an open rounded crown and <br />slender, spreading branches. Bark is dark gray and shallowly furrowed on a <br />mature tree. Silver-gray twigs have a zig-zag shape with a leaf bud at each <br />turn. <br />Leaves: Alternate, small, (1- 2"), elliptic, toothed, short-pointed at the tip, <br />slightly uneven at the base (much less than American elm). <br />Flowers: Greenish, lacking petals and occurring in small, compact, drooping <br />clusters of 2- 5, appear before leaves develop. <br />Fruit: Winged, round, and smooth, contains on seed; fruit hangs in clusters. <br />Ecological Threat: <br />. The tree can invade and dominate disturbed prairies in just a few years. <br />. Seed germination rate is high and seedlings establish quickly in sparsely <br />vegetated areas. <br />. It grows readily in disturbed areas with poor soils and low moisture. <br />. A native of eastern Asia, Siberian elm was introduced to the U.S. in the <br />1860s for its hardiness, fast growth, and ability to grow in various <br />moisture conditions. It is still sold commercially as a shelterbelt and <br />windbreak tree. <br />http://www.dnr. state.mn.us/invasives/terrestrialplants/woody/siberianelm.html <br />Invasive species <br />Main pa�e <br />Invasive Species Prog <br />Invasive species prog <br />links <br />Get a Habitattitude <br />Stop Ac�uatic Hitchikf <br />MN invasive species 1 <br />Invasive s�ecies FAO <br />Natural resources <br />Animals <br />Plants <br />Rocks & ininerals <br />Endangered species <br />Invasive s�ecies <br />Climate <br />Forests <br />Prairies <br />Water <br />. <br />w.�.,�,s:�, <br />C�atiS��'.4'ATE��1�? <br />��C��.�C��T���. y,��; <br />—� <br />11 /15/2006 <br />