Leaf Identification

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Leaf Identification

• to identify broad and narrow shaped leaves
• to identify simple and compound leaf groupings
• to identify leaf arrangement
• to identify leaf margin characteristics
• to identify leaf venation
• to identify leaf structure

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Leaf Structure

• The Leaf Blade
• The blade is the entire leaf unit. Sometimes this
  is made up of several smaller leaflets.  

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Leaf Veins
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Leaf Margin

• The margin is the term used to describe the edge
  of the leaf.

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Leaf Base

• Base is the name given to the part of the blade
  that is closest to the stem.

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Leaf Apex

• The Apex is the tip of the leaf.

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Petiole

• The Petiole is the thin stalk that connects the
  leaf blade to the stem

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Stipule

• Stipules are tiny leaf-like structures that may
  or may not be present at the base of the petiole.

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Petiolate and Sessile

• Leaves which have petioles are called Petiolate

• If a leaf has no petiole it is called Sessile.

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Seven Main Leaf Structures
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Leaf Blade

• The main part of a leaf is the blade.

• Nine major shapes
• Linear
• Lanceolate
• Oblong
• Elliptic
• Ovate Cordate
• Reniform
• Spatulate
• Orbicular

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Linear

• Narrow, with parallel or nearly parallel side

 
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Lanceolate
lance shaped, longer than broad and tapering to
a point at the tip
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Oblong

• Much longer than wide, with nearly parallel sides

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Elliptic

• Shaped like an ellipse, wider at the center and
  tapering to equal tips

 
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Ovulate

•   egg-shaped, broader at the base than the tip 

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Cordate

• Heart shaped, either the leaf shape or base

 
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Reniform

• Kidney shaped

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Spatulate

• In the shape of a spatula or spoon

 
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Orbicular

• Round

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Leaf Groupings

• How leaves are grouped on stem
• Simple
• Compound

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Three types of compound
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Leaf Margins

• The shape of the edge or margin of a leaf is
  another way it can be identified. Three kinds of
  margins are Entire, Toothed, and Lobed.

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Entire
Smooth no bumps
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Toothed

• Shallow bumps

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Dentate

• Pointing outward

                                                            
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Serrate

• Point to the leafs tip

                                                            
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Crenate

• Broad and round

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Incised

• deeply cut with sharp, irregular teeth

                                                            
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Lobed

• deep indents or sinuses

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Sinnate

• very wavy margin

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Undulate

• wavy margin, but not as wavy as a sinuate margin