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Leaf Identification - PowerPoint PPT Presentation


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Leaf Identification. to identify broad and narrow shaped leaves to identify simple and compound leaf groupings to identify leaf arrangement to identify leaf margin characteristics to identify leaf venation to identify leaf structure. Leaf Structure. The Leaf Blade

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Leaf Identification


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    1. Leaf Identification to identify broad and narrow shaped leaves to identify simple and compound leaf groupings to identify leaf arrangement to identify leaf margin characteristics to identify leaf venation to identify leaf structure

    2. Leaf Structure • The Leaf Blade • The blade is the entire leaf unit. Sometimes this is made up of several smaller leaflets.

    3. Leaf Veins

    4. Leaf Margin • The margin is the term used to describe the edge of the leaf.

    5. Leaf Base • Base is the name given to the part of the blade that is closest to the stem.

    6. Leaf Apex • The Apex is the tip of the leaf.

    7. Petiole • The Petiole is the thin stalk that connects the leaf blade to the stem

    8. Stipule • Stipules are tiny leaf-like structures that may or may not be present at the base of the petiole.

    9. Leaves which have petioles are called Petiolate If a leaf has no petiole it is called Sessile. Petiolate and Sessile

    10. Seven Main Leaf Structures

    11. The main part of a leaf is the blade. Nine major shapes Linear Lanceolate Oblong Elliptic Ovate Cordate Reniform Spatulate Orbicular Leaf Blade

    12. Linear • Narrow, with parallel or nearly parallel side

    13. Lanceolate lance shaped, longer than broad and tapering to a point at the tip

    14. Oblong • Much longer than wide, with nearly parallel sides

    15. Elliptic • Shaped like an ellipse, wider at the center and tapering to equal tips

    16. Ovulate •   egg-shaped, broader at the base than the tip 

    17. Cordate • Heart shaped, either the leaf shape or base

    18. Reniform • Kidney shaped

    19. Spatulate • In the shape of a spatula or spoon

    20. Orbicular • Round

    21. Leaf Groupings • How leaves are grouped on stem • Simple • Compound

    22. Three types of compound

    23. Leaf Margins • The shape of the edge or margin of a leaf is another way it can be identified. Three kinds of margins are Entire, Toothed, and Lobed.

    24. Entire Smooth no bumps

    25. Toothed • Shallow bumps

    26. Dentate • Pointing outward

    27. Serrate • Point to the leaf’s tip

    28. Crenate • Broad and round

    29. Incised • deeply cut with sharp, irregular teeth

    30. Lobed • deep indents or sinuses

    31. Sinnate • very wavy margin

    32. Undulate • wavy margin, but not as wavy as a sinuate margin