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Lovely, Lovely Leaves

Lovely, Lovely Leaves. Leaf arrangement. Decussate. Opposite. Leaf arrangement. Alternate. Basal rosette. Function and Shape. Leaf Venation. Parallel venation. Net venation. Petiole. Sessile leaves. Axillary Buds. Simple & Compound Leaves. NB. position of axillary bud.

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Lovely, Lovely Leaves

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  1. Lovely, Lovely Leaves

  2. Leaf arrangement Decussate Opposite

  3. Leaf arrangement Alternate Basal rosette

  4. Function and Shape

  5. Leaf Venation Parallel venation Net venation

  6. Petiole Sessile leaves

  7. Axillary Buds

  8. Simple & Compound Leaves NB. position of axillary bud

  9. Leaf Sheath & Ligule (monocots) • Intercalary meristem • also important in • Monocots (esp. • grasses) Ligule Sheath

  10. New Leaves Shoot apical meristem

  11. The Epidermis

  12. Glandular Trichomes Drosera Dionaea

  13. Sarracenia

  14. Basic Leaf Anatomy Xylem Bundle sheath Phloem

  15. Mesophyll sub-stomatal chamber

  16. Kranz Anatomy

  17. Leaf c.s. through midrib

  18. Leaf Abscission Abscission layer

  19. Cotyledons • Mostly storage organs

  20. Heterophylly • Leaves may be quite different (e.g., in beans, juvenile leaves are entire, while adult leave are compound)

  21. Xerophytes • Thick cuticle • Sunken stomata • Reduced air spaces in mesophyll (succulent) • Trichomes – boundary layer humid • Multiple epidermal layers

  22. Hydrophytes • Thin cuticle • Lack characteristics for water conservation • Leaves often lobed (underwater)

  23. Special Features • Bulbs • Tendrils • Plantlets • Insect traps Kalanchoë

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