Tree:Leaf characteristics

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Forestry Power Point

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Dichotomous key: 

Dichotomous key The following items are necessary to use the key to identify the leaves we will observe.

Simple Leaf: 

Simple Leaf One leaf per stem

Compound leaf: 

Compound leaf Several leaflets attached to one stem

Broad leaf (deciduous): 

Broad leaf (deciduous) Like the name says…a broad leaf This is the type of leaf that changes color and falls off in Autumn

Flat or needle like leaf (coniferous): 

Flat or needle like leaf (coniferous) Like a christmas tree Ginkgo is the exception here, a ginkgo tree is a conifer, but it has broad leaves!

Opposite branching: 

Opposite branching Leaves are opposite of one another. Twigs are opposite of one another on the branch

Alternate branching: 

Alternate branching Leaves are aranged alternately on the stem…like steps Twigs are arranged alternate on the branch

Whorled braching: 

Whorled braching Leaves whorl around the entire twig. Twigs whorl around the entire branch

Lobed leaf margin: 

Lobed leaf margin Wavy edges

Entire leaf margin: 

Entire leaf margin Smooth around the edges

Serrated Leaf margin: 

Serrated Leaf margin The edges have fine “teeth” like a serrated knife!

Pinnate vein formation: 

Pinnate vein formation There is one main vein, with many smaller veins branching off

Palmate vein formation: 

Palmate vein formation The main veins radiate from central point Kind of like the fingers radiate from the palm of your hand!

Parallel vein formation: 

Parallel vein formation The veins run parallel to one another