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Chapter 6: Leaves (External Structure (leaf blade (veins (monocots…
Chapter 6: Leaves
External Structure
leaf blade
flat & wide
add S.A.
Simple
one part
Compound
divided parts
leaflets
pinnately
individual points along rachis
palmately
same point
petiolule
veins
monocots
parallel venation
eudicots
reticulate venation
dorsal surface
bottom
large veins
ventral surface
upper
smooth
Petioles
stalk
no petioles
sessile leaf
leaf shape
plant identification
margin
apex
base
abscision zone
leaf cut
scar
Internal Structure
epidermis
water loss
transpiration
waterproof & translucent
stomata
bottom=more
hairy
waxy
cutin
mesophyll
ground tissues
upper
palisade parenchyma
main photosynthetic tissue
lower
spongy
aerenchyma
petiole
transition between stem and bottom
stipules
vascular bundles
Vascular Tissue
between the two
midrib
lateral veins
minor veins
release water from xylem
load sugar into phloem
midrib & lateral
bundle sheath
bundle sheath extension
Initiation and Development
Basal Angiosperms & Eudicots
Monocots
conduction not interrupted
apical meristem
leaf primordium
protrusion
Morphology & Anatomy
modified
#
succulent leaves
water conservation
reduced photosynthesis =
thick
nitrogen procurement
insect traps
protection
bud scales
small
short petiole
tough
waxy
produce thin layer of corky bark
spines
no mesophyll
needle
closely packed fibers
mature
lignin
harden
support
tendrils
sense contact
indefinite growth
sclerophyllous foliage leaves
thick cuticle
abundant waxes
leaves of conifers
also have thick cuticle
thick cell walls
simple leaves
Kranz anatomy
C4 metabolism
bundle sheaths
XL chlorophyll
arid environments
function
photosynthesis
modified
