1. Principles of Agricultural Science – Plant 1

2. 2 Leaf External Parts and Types Unit 4 – Anatomy and Physiology Lesson 4.4 Leave It to Leaves Principles of Agricultural Science – Plant

3. 3 Forms of Leaves Leaves come in many shapes and forms

4. 4 Leaf Parts Tip Petiole Secondary Vein Midrib Base Margin Blade Can You Name Them?

5. 5 Leaf Types Leaves come in various sizes, colors, and physical features. You can use physical features to distinguish among different species and varieties of plants. Leaf features assist with classification and identification of plants.

6. 6 Physical Features of Leaves Leaves have several physical features to examine: Simple versus compound Shape Venation Margin Tip Base Arrangement on stem

7. 7 Simple Versus Compound SimpleCompound

8. 8 Leaf Shapes Leaf shapes are listed on page 46 in the text

9. 9 Leaf Venation Venation refers to how the veins are orientated within the leaf structure Parallel Pinnate Palmate

10. 10 Leaf Margin The edges of the leaves provide clues also Serrate Entire Dentate

11. 11 Leaf Tip Several styles of leaf tips exist Cuspidate Mucronate Obtuse

12. 12 Leaf Base The location of where the petiole attaches to the leaf blade is another point of reference

13. 13 Leaf Arrangement on the Stem Arrangement of leaves on the stem provides good clues. There are arrangements for both simple and compound leaf structures. Simple Alternate Simple Opposite

14. 14 References Parker, R. (2010). Plant and soil science: Fundamentals and applications. Clifton Park, NY: Delmar.