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Chapter 6: Leaves (Morphology and Anatomy of Other Leaf Types (Tendrils…
Chapter 6: Leaves
Morphology and Anatomy of Other Leaf Types
Spines
Axillary buds
No mesophyll parenchyma
Tendrils
Modified leaf
grow indefinitely
Sense contact
No lamina
Bud Scales
Primarily protective
Rarely compound
Small
Petiole is short/absent
Leaves with Kranz Anatomy
No palisade parenchyma or spongy mesophyll
prominent bundle sheaths
C4 photosynthesis
Adapted to arid environments
Leaves of Conifers
sclerophylls
simple leaves
scale-like leaves
Broad scale leaves
Needles
Insect Traps
Trap and digest insects
Get Nitrogen
Active trap
Move during capture
Passive trap
Incapable of movement
Sclerophyllous Foliage Leaves
Produce more sugars
Succulent Leaves
Portulacaceae
Portulaca
Lewisia
Aizoaceae
ice plant
Crassulaceae
Kalanchoe
Sedum
Thick and fleshy
Internal Structure of Foliage Leaves
Epidermis
Transpiration
Loss of water
Mesophyll
palisade parenchyma
palisade mesophyll
spongy mesophyll
Petiole
leaf traces
stipules
two small flaps
Vascular Tissues
midrib
lateral veins
minor veins
bundle sheath
bundle sheath extension
External Structure of Foliage Leaves
Leaf Blade(lamina)
Simple Leaf
Compound Leaf
Dorsal Surface(abaxial side)
Ventral Surface(adaxial)
Petiole(stalk)
Petiolule
Abscission Zone
Leaf Scar
Initiation and Development of Leaves
Monocots
Basal Angiosperms and Eudicots
leaf primordium
