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Pinnately Compound Leaf: <br />Leaflets form in rows along either side of the central vein. <br />Samara: <br />A type of fruit with wings found on maple and ash trees. <br />Serrate: <br />A leaf that has jagged edges pointing towards the tip of the leaf. <br />Simple (leaf): <br />Leaves that are singular; singularity attached leaves. <br />Species Tree Code: <br />The four letter code used by the U.S. Forest Service to designate trees by their genus and species. <br />Stag Heading: <br />The complete dearth and defoliation of main branches. Branches have an antler -like appearance. <br />Stem: <br />The trunk of the tree, excluding branches and leaves. <br />Stem Circumference: <br />The circular measurement around the stem of the tree. <br />Suckers: <br />Suckers are sprouts that develop at the base of the tree stem or off of the tree's root system. <br />Terminal Bud: <br />Terminal buds are the buds seen at the very tips of twigs. Note: not all species have terminal <br />buds. <br />Tip Dieback: <br />Dieback that begins at the tip of a twig and works backward to the stem. <br />Tree Defects: <br />Any condition such as decay, cavities, included bark/weak branch attachments, cracks or cankers <br />that occur anywhere on a tree and may cause the structural failure of part of, or the whole, tree. <br />Water Sprouts: <br />Sprouts, or water sprouts, are fast growing excess shoots that grow out of the main stem of the <br />tree. <br />Whorled (leaf): <br />Three or more leaves that are attached to the branch opposite each other. <br />Winter Injury: <br />Injury caused by a freezing following a period of warmer weather. <br />Wood Decay: <br />Wood that is rotting or missing due to fungus or bacteria. <br />24 <br />