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Identify Trees by Their Leaves

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1 Identify Trees by Their Leaves
Listen to a Harvard professor explain the basic parts and functions of trees. Dr. Holbrook talks about the leaves, trunks, bark, and roots of trees. We are going to concentrate on the leaves. Define the following terms: HarvardMuseumNatHist. “What Is a Tree?” YouTube, YouTube, 7 Oct. 2014, 1. epidermis a waxy layer on the leaf that prevents water loss 2. stomata openings on the underside of leaves that allow carbon dioxide in and water vapor out. 3. chloroplasts Specialized green structures that carry out photosynthesis. 4. xylem tissue in the veins of leaves that bring up water and minerals from the roots 5. phloem tissue in the veins of leaves that transport sugars produced by photosynthesis to other parts of the tree to be used for respiration and growth.

2 We can identify many trees by examining their leaves
We can identify many trees by examining their leaves. Here are some questions to ask: Does the tree drop its leaves in the fall (coniferous, deciduous)? How do the leaves attach to the branches (alternate, opposite, whorled) What do the leaves look like? Consider… -- vein pattern, palmate or pinnate -- leaf shape, lobed or unlobed --leaf symmetry, symmetric or not --leaf edge, toothed or smooth margins Let’s use some online keys to identify trees on the GCS campus.

3 GCS #1 I think this tree is a … because… Clue: Needles are flat.
3. "LEAF - Wisconsin's K-12 Forestry Education Program." UWSP. N.p., n.d. Web. 06 Sept Look for mystery tree #14 4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept Clue: Needles are flat. Clue: Cones are approximately ¾” long.

4 GCS #2 I think this tree is a … because…
3. "LEAF - Wisconsin's K-12 Forestry Education Program." UWSP. N.p., n.d. Web. 06 Sept Look for mystery tree #17 4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept Clue: If you crack a leaf at the base of its stem, it releases a milky sap.

5 GCS #3 I think this tree is a … because…
4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept 5. “What Tree is That?” Eastern and Central U.S. Trees

6 GCS #4 I think this tree is a … because… Clue: The bark is papery.
3. "LEAF - Wisconsin's K-12 Forestry Education Program." UWSP. N.p., n.d. Web. 06 Sept Look for mystery tree #4 4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept Clue: The bark is papery.

7 GCS #5 I think this tree is a … because…
4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept 5. “What Tree is That?” Eastern and Central U.S. Trees Clue: Female trees have a fleshy fruit that is white, pink, or purple.

8 GCS #6 I think this tree is an … because…
3. "LEAF - Wisconsin's K-12 Forestry Education Program." UWSP. N.p., n.d. Web. 06 Sept Look for mystery tree #9 4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept

9 GCS #7 I think this tree is a … because…
3. "LEAF - Wisconsin's K-12 Forestry Education Program." UWSP. N.p., n.d. Web. 06 Sept Look for mystery tree #19 4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept

10 GCS #8 I think this tree is a … because… Clue: Leaf stem is round.
1. "Identify by Leaf." Identify by Leaf. N.p., n.d. Web. 06 Sept 3. "LEAF - Wisconsin's K-12 Forestry Education Program." UWSP. N.p., n.d. Web. 06 Sept Look for mystery tree #15 5. “What Tree is That?” Eastern and Central U.S. Trees Clue: Leaf stem is round. Clue: Bark is not papery, but smooth and gray.

11 GCS #9 I think this tree is a … because…
4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept 5. “What Tree is That?” Eastern and Central U.S. Trees Clue: Cones are long with thin scales.

12 GCS #10 I think this tree is a … because…
1. "Identify by Leaf." Identify by Leaf. N.p., n.d. Web. 06 Sept 4. Nix, Steve. "Tree Leaf Key: Method of Tree Identification." N.p., n.d. Web. 06 Sept

13 GCS #11 I think this tree is a … because…
1. "Identify by Leaf." Identify by Leaf. N.p., n.d. Web. 06 Sept Clue: Leaf margins have fine, double teeth. Clue: Leaf stems are short. Clue: Leaves are smooth, without hairs on both surfaces.

14 GCS #12 I think this tree is a … because…
1. "Identify by Leaf." Identify by Leaf. N.p., n.d. Web. 06 Sept 5. “What Tree is That?” Eastern and Central U.S. Trees Hint: distinctive peeling bark, seed balls grow singly, wide tree shape


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