Lovely, Lovely Leaves - PowerPoint PPT Presentation

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Lovely, Lovely Leaves

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Leaf Abscission. Abscission. layer. Cotyledons. Mostly storage organs. Heterophylly. Leaves may be quite different (e.g., in beans, juvenile leaves are entire, while ... – PowerPoint PPT presentation

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Title: Lovely, Lovely Leaves


1
Lovely, Lovely Leaves
2
Leaf arrangement
Opposite
Decussate
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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