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Identification Help
How to Use a Dichotomous Key |
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- Begin by observing the whole specimen you want to identify. In this example, we will use a tree. Make notes about the habitat in which it is growing (near water, in the shade, near the street), its size, and its overall shape (umbrella, upright, pyramidal, vase).
- Then look for distinguishing features. These are different for each type of tree, but be sure to make notes on such features as the color and texture of the bark, fruits, and leaves or needles; the pattern in which the buds, leaves or needles are arranged; the numbers of leaves or needles on a stem; and any other features peculiar to the tree, such as thorns, milky sap, pungent odor, or insect activity.
- Next, begin working with a dichotomous key for trees. The key immediately gives you two alternatives. Read both, decide which description best fits your evidence, and move on to the next set of two alternatives given in the key.
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