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Native or Introduced to Illinois: native
Natural Habit in Illinois: dry ridges to bottomland woods
Leaf: The single leaves have five to nine rounded lobes, with a large end lobe. The leaves are divided in half near the center with a deep lobe almost to mid-vein. They leaves are dark shiny green above, and light green to gray below. The top portion of the leaf is more wavy than lobed.
Flower: Male and female flowers are inconspicuous and are borne in separate catkins (the tree is monoecious) on the current years branchlets.
Fruit: The acorn is large, almost round with a bur or moss-like, fringed cup covering half or more of the acorn.
Bark/Twig: The thick, deeply furrowed bark breaks into distinct ridges. On small branched and twigs it is brownish, roughened and corky.
Size/Form/Shape: The Bur Oak is strong-branched, usually with a dense crown.
County Distribution Map for Illinois:
Sources for the Sullivan Middle School Tree Identification Guide were obtained though the use of the following sites:
- Illinois Plant Information Network (ILPIN) @ http://www.fs.fed.us/ne/delaware/ilpin/ilpin.html#Background
- List of Woody Plants Native or Naturalized in Illinois @ http://www.inhs.uiuc.edu/~kenr/woody.html
- Tree Species @ http://ostermiller.org/tree/species.html
- Index to Eastern/Central Trees @ http://www.arborday.org/trees/ECtreelist.html
- ISU Forestry Extension Identification of Common Trees of Iowa @ http://www.extension.iastate.edu/Pages/tree/
- Key to Leaves of Virginia Trees @ http://www.fw.vt.edu/dendro/forsite/key/intro.htm
- List of Native Trees for Use Along Roadsides in Illinois @ http://www.inhs.uiuc.edu/~kenr/treetable.html
- The PLANTS Database @ http://plants.usda.gov/
The information below is from the National Arbor Day Foundation. This information can be viewed in the original (source) form by visiting The National Arbor Day Foundation at http://www.arborday.org.
Sun Exposure: This oak does well in ull sun.
Soil Type: The Bur Oak grows in acidic, alkaline, loamy, clay, sandy, wet, well-drained, wide range of soils; adapts well to urban setting and is drought tolerant.
Moisture: Moderate moisture with some drought tolerance.
Growth Rate: This tree grows at a slow growth rate.
Hardiness Zones: 3 - 8
This oak can be expected to grow in the zones shown in color in the arborday.org zone map.