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Leaves (External Structure of Foliage Leaves (Sessile Leaf (self shading…
Leaves
Internal Structure of Foliage Leaves
Vascular Tissues
Midrib
edict usually has one
"Midvein"
Lateral Veins
emerge from the midrib
branch into narrow minor veins
Minor Veins
most important for releasing water from xylem
loads sugar into he phloem
between the palisade parenchyma and spongy mesophyll
Bundle Sheath
Bundle Sheath Extension
help give rigidity to the blade
moves water from the bundle to the mesophyll
Figure 6-25
Epidermis
Transporartion
water lose through the epidermis
serious problem if soil is too dry that roots cannot replace lost water
Mesophyll
the ground tissues interior to the leaf epidermis
Palisade Parenchyma
"Palisade Mesophyll"
main photosynthetic tissue of most plants
along the upper surface of most leaves
Spongy Mesophyll
lower portion of the leaf
open, lose aerenchyma that permits carbon dioxide to diffuse rapidly away from the stoma
into all parts of the leaf's interior
Figure 6-24
Figure 6-22
Figure 6-23
Petiole
stalk
holds the blasé out into the light
Leaf Traces
Stiples
protection
two small flaps
External Structure of Foliage Leaves
Leaf Blade
"Lamina"
flat, light-harvesting portion
Dorsal Surface
blades lower side
Abaxial Side
large veins protrude like backbone
Ventral Surface
upper side
Sessile Leaf
self shading is not a problem
no petiole
Aeonium
Sheathing Leaf Base
when the leaf base wraps around the stem
Simple Leaf
blade that's one part
Compound Leaf
blade divided into several individual parts
Leaflets
small blades
Petiolule
an extension of the petiole,
Rachis
Veins
bundles of vascular tissue
Reticulate Venation
netted pattern
Parallel Ventation
In Monocots with long strap-shaped leaves
the larger veins run side by side with few obvious interconnections
Abscission Zone
in leaf base in petiole
cells are involved in cutting off leaf when its useful like is over
Leaf Scare
adjacent undamaged cells swell and become corky
protective scar tissue
Figure 6-7
Initation and Development of Leaves
Basal Angiosperms and Eudicots
Leaf Primordium
narrow cone
taller than the apical meristem
Monocots
Figure 6-31
Morphology and Anatomy of Other Leaf Types
Succulent Leaves
thick and fleshy
desert environments
Figure 6-35
Sclerophyllous Foliage Leaves
foliage
Leaves of Conifers
Bud Scales
perennial
primary protection
Spines
axillary buds
Figure 6-38
Figure 6-41
Tendrils
peas, cumberer, squash
Figure 6-43
Figure 6-44
Leaves with Kranz Anatomy
adapts C4 plants to their enoriments
Insect Traps
Figure 6-45
