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Leaf Morphology

Leaf Morphology. Tell me about these…. Similarities and differences. What do you know about leaves?. Types of Leaves. Parts of a Leaf. Tip : terminal point of a leaf Blade : flattened green expanded portion Margin : edge of a leaf Midrib : most prominent central vein

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Leaf Morphology

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  1. Leaf Morphology

  2. Tell me about these… Similarities and differences

  3. What do you know about leaves?

  4. Types of Leaves

  5. Parts of a Leaf • Tip: terminal point of a leaf • Blade: flattened green expanded portion • Margin: edge of a leaf • Midrib: most prominent central vein • Lateral veins- secondary veins in a leaf • Petiole- leaf stalk that connects blade to stem • Stipules-leaf-like appendages. They can protect the young leaf and may be modified into spines or tendrils

  6. Compound Leaves • Leaflet- 20 leaf of a compound leaf • Rachis- an extension of the petiole bearing leaflets • Petiolule- leaflet stalk • Petiole- leaf stalk • Lateral veins- 20 veins in a leaf • Stipules-leaf like appendages

  7. Compound Leaves Palmately Compound (digitate)- no rachis Pinnately Compound (pinnate)- rachis

  8. Compound Leaves

  9. More Compound Leaves

  10. Leaf Attachment Petiolate- blade attached by petiole Sessile- no petiole

  11. SHEESH! THAT’S TOUGH! Count to ten and breathe

  12. PAIR UP, SKETCH, & LABEL! PALMATELY COMPOUND-DIGITATE PINNATE SIMPLE-PETIOLATE BIPINNATE

  13. Are you ready for more? Let’s go!

  14. Leaf Arrangement

  15. Leaf Venation

  16. Leaf Margins

  17. Leaf Shapes • Cordate- heart shaped • “ob”- widest part at the base

  18. Project due Thursday 8/22! • Label neatly • 10 characteristics could use less than 10 specimens! • Start tonight with your leaves  • YOU GUYS DID GREAT!

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