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Chapter 6: Leaves (External Structure of Foliage Leaves (monocot (long and…
Chapter 6: Leaves
External Structure of Foliage Leaves
leaf blade (lamina)
simple leaf
compound leaf
small blade (leaflets)
petiolule
rachis
dorsal surface (abaxial side)
ventral surface (adaxial)
petiole (stalk)
abscission zone
leaf scar
sessile leaf
no petiole
Aeonuim
monocot
long and tapered
grasses
irises
lilies
agaves
yuccas
sheathing leaf base
within leaves
veins
reticulate venation
Morphology and Anatomy of Other Leaf Types
succulent leaves
families
Crassulaceae
Kalanchoe
Sedum
Portulacaceae
Portulaca
Lewisia
Aizoaceae
ice plant
favors water conservation
lack of air spaces in mesophyll
bud scales
tight layer around stem tips
protection
small
rarely compound
petiole
short
absent
tough
waxy
sclerophyllous foliage leaves
barberry
holly
Agave
Yucca
perennial
feasible
spines
modified leaves of axillary buds
protection
no blade
needle shaped
leaves of conifers
sclerophylls
thick cuticles
unpalatable chemicals
simple
needles
perennial
evergreens
tendrils
modified leaf
grow indefinitely
sensing contact with and object
leaves with Kranz Anatomy
C4 photosynthesis
lack palisade parenchyma
lack spongy mesophyll
prominent bundle sheaths
insect traps
obtain nitrogen from insects
active traps
Leaves of Sundew (
Drosera
)
move during capture
Venus' flytraps (
Dionaea muscipula
)
passive traps
Nepenthes
Darlingtonia
Sarracenia
incapable of movement
Internal Structure of Foliage Leaves
epidermis
transpiration
reasonably water proof
epidermal cells
guard cells
trichomes
vascular tissue
midrib
lateral veins
minor veins
bundle sheath
bundle sheath extension
mesophyll
palisade parenchyma (palisade mesophyll)
spongy mesophyll
petiole
leaf traces
stipules
Concepts
leaves provide
protection
bud scales
spines
support
tendrils
storage
fleshy leaves of bulbs
nitrogenous procurement
trapping
digesting insects
shoot system
stems
leaves
demonstrates divisions
labor
integration
Initiation and Development of Leaves
basal angiosperms and eudicots
leaf primordium
initiation
autumn
summer
lamina
development
increases in thickness
bulk of midrib
enlarge lamina rapidly
monocots
initiation
expansion of shoot apical meristem cells
grow upward
becomes part of primordium
development
tube inside leaf's sheathing base
elongates
