principles of agricultural science – plant 1. 2 leaf external parts and types unit 4 – anatomy...
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Principles of Agricultural Science – Plant
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Leaf External Parts and Types
Unit 4 – Anatomy and PhysiologyLesson 4.4 Leave It to Leaves
Principles of Agricultural Science – Plant
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Forms of Leaves
Leaves come in many shapes and forms
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Leaf Parts
Tip
Petiole
Secondary Vein
Midrib
Base
Margin
BladeCan You Name Them?
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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.
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Physical Features of Leaves
Leaves have several physical features to examine:
Simple versus compoundShapeVenationMarginTipBaseArrangement on stem
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Simple Versus Compound
Simple Compound
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Leaf Shapes
Leaf shapes are listed on page 46 in the text
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Leaf Venation
Venation refers to how the veins are orientated within the leaf structure
Parallel
PinnatePalmate
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Leaf Margin
The edges of the leaves provide clues also
SerrateEntire Dentate
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Leaf Tip
Several styles of leaf tips exist
CuspidateMucronate Obtuse
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Leaf Base
The location of where the petiole attaches to the leaf blade is another point of reference
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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
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References
Parker, R. (2010). Plant and soil science: Fundamentals and applications. Clifton Park, NY: Delmar.