Question

What is a key? How is it used to identify a plant?​

Answer 1

Keys used in floras are usually diagnostic, that is, identifying an unknown plant by the conspicuous features. Diagnostic characters are sometimes referred to as key characters. A key may be short and limited to a single pair of contradictory statements or propositions.

Answer 2

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A key is a device for easily identifying an unknown plant by a sequence of choices between two or more statements. A key is an artificial analytical device or arrangement where by a choice is provided between two contradictory characters resulting in the acceptance of one and the rejection of the other.

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