1. Plant Anatomy: Leaves
Horticulture I

2. Plant Parts
Leaves
Stems
Roots
Flowers

3. Leaves-External
Petiole-leaf stalk or part that connects the leaf to the stem
Blade-the large, flat part of the leaf
Midrib-the large center vein
Veins-the structural framework of the leaf
Margin-the edge of the leaf
Apex-leaf tip

4. Leaves-External

5. Leaves-Internal
Upper and lower epidermis-skin of the leaf that prevents the loss of too much moisture
Stomates-small openings under the leaf for breathing or transpiration
Guard Cells-open and close stomates
Chloroplasts-small green particles that contain chlorophyll, give leaves green color and necessary for photosynthesis

6. Leaves-Internal

7. Functions of the Leaf Photosynthesis: Transpiration: Respiration:
Process by which plants capture sunlight and use it to convert carbon dioxide and water into food.
Transpiration:
Release of water vapor from the leaves of the plants. Cools the plant.
Respiration:
Convert sugars and starches into energy.  

8. Leaf Type

9. Leaf Arrangement
Alternate
Opposite
Whorled

10. Vein Pattern

11. Leaf Shapes Cordate Elliptical Ovate Spatulate Deltoid Lanceolate
Star-Shaped
Linear

12. Leaf Margin

13. More Leaves… Sessile: No petiole Glabrous: Smooth, non-hairy
Ex: Zinnia
Glabrous: Smooth, non-hairy
Ex: Southern Magnolia
Pubescent: Leaves or stems have hairy feel
Ex: African Violet
Bract
Ex: Poinsettia
Needle
Ex: Pine Tree

14. Leaf Scavenger Hunt Find a compound & simple leaf
Find 2 different leaf arrangements
Find 2 leaf shapes
Find 3 leaf margins
Press the leaves