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Chapter 6: Leaves (External Structure of Foliage Leaves (leaf blade (upper…
Chapter 6: Leaves
External Structure of Foliage Leaves
leaf blade
flat
light harvesting
lamina
lower side
dorsal surface
abaxial side
upper side
ventral surface
adaxial side
usually smooth
petiole
stalk
holds leaf up
small/long narrow leaves
sessile leaf
sheathing leaf base
simple leaf
blade of just one part
compound leaf
blade divided into several individual parts
veins
inside leaves
bundles of vascular tissue
Internal Structures of Foliage Leaves
epidermis
flat, thin foliage leaves
large surface area
transpiration
water loss
mesophyll
ground tissues interior
palisade parenchyma
layer of cells
spongy mesophyll
lower portion of leaf
vascular tissue
midrib
mid-vein
lateral veins branch
into minor veins
bundle sheath
fibers arranged as a sheath
Initiation and Development of Leaves
Basal Angiosperms and Eudicots
leaf primordium
base of meristem
grows outwards
Monocots
initiated by expansion of apical root meristem cells
Morphology and Anatomy of Other Leaf Types
Succulent Leaves
thick
fleshy
reduces surface to volume ratio
Sclerophyllous Foliage Leaves
produce sugars
Leaves of Conifers
thick cuticle
epidermis and hypodermic have thick walls
Bud Scales
most common modification
common in perennial plants
Spines
pointy parts on cacti
Tendrills
peas
cucumbers
squash
