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