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Leaf Identification

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

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