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40th Anniversary, CUHK
Flower talks

Keys are devices bearing a series of contrasting or contradictory statements (leads), requiring an identifier to make comparisons and select the statements that match the material to be identified.

A commonly used key is the Dichotomous key. A dichotomous key offers only two choices at every step. Such keys can be presented in either indented or bracketed forms.

The advantage of using a key is that it is fast, because it directs the identifier to check definitive characteristics.

The disadvantage of a key is that it tends to be rigid, and would become useless when the stated characters are not available.
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