A Key is an analytical scheme for the identification of plants and animals based on the similarities and differences. The keys are based on the contrasting characters, generally in a pair called couplet. Each couplet actually represents the choice made between two opposite options, leading to the acceptance of one Each statement in the key is called a lead keys are of two types.
- Indented keys, which provides a sequence of choices between two or more statements of character of species
- Bracketed keys, where pairs of contradict-ing characters are used for identification, the number on the right of the statement indicate the recent choice of paired contrasting statements.
