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Leaves - Coggle Diagram
Leaves
External Structure of Foliage Leaves
Petiole Stalk
Holds Blade Into the Light
Sessile Leaf
Leaves are Small, Very Long and Narrow, Self Shading
Leaf Blade (Lamina)
Flat, Light Harvesting Portion
Dorsal Surface (Abaxial Side )
Blade's Lower Side
Ventral Surface (Adaxial Side )
The Upper Side, Usually Rather Smooth
Sheathing Leaf Base
Leaf Wraps Around the Stem
Simple Leaf Blades
Has a Blade of Just One Part
Compound Leaf
Has A Blade Divided into Several Individual Parts
Leaflets
Attached by Petiolule to an Extension of the Petiole
Veins
Bundles of Vascular Tissue that Distributes Water From Leaf Into Stem
Reticulate Venation
The Netted Pattern of Distribution in Angiosperms and Eudicots
Parallel Venation
Pattern of Distribution in Monocots with Long, Strap Shaped Leaves.
Abscission Zone
Orientated Perpendicular to the Petiole, Responsible for Cutting off Leaf at the End of Life Cycle
Morphology and Anatomy of Other Leaf Types
Succulent Leaves
Thick and Fleshy , a Shape that Reduces the Surface to Volume Ratio
Spherical or Cylindrical Leaves for Optimum Surface - Volume Shape
Sclerophyllous Foliage Leaves
In Some Species, Leaves are Evolved to Exist for more than 2 years.
Feasible, Hardness Makes the More Resistant to Animals, Fungi , Freezing Temps and UV light.
Leaves of Conifers
Leaves are Sclerophylls
Contain Unplatable Chemicals
Simple Leaves , Never Compound
Perennial Leaves, Bristlecone Pine Leaves Live for at least 5 years
Bud Scales
Form a Tight Layer of Around the Stem Tip
Tougher and Waxier than Regular Leaves
Most Common Modification of Leaves
Internal Structure of Foliage Leaves
Mesophyll
Ground Tissue Interior to the Leaf Epidermis
Palisade Parenchyma
Upper Surface of Most Leaves, Layer of Cells, Main Photosynthetic tissue of Most Plants
Spongy Mesophyll
Loose Aerenchyma that Permits Carbon Dioxide to Diffuse Rapidly
Vascular Tissue
Midrib
Large Vein that Runs Through the Center of Leaf
Lateral Veins Emerge into the Minor Veins
Bundle Sheath
Fibers Arranged as Sheath
Bunde Sheath Extension
Help Give Rigidity to the Blade, and Helps Water Move to Mesophyll
Transpiration
Water Loss Through the Epidermis
Serious Problem in Dry Climates, When Roots Can't Replace Loss