Bracketed key-

1. It keeps the two leads of every couplet and easier for comparison.

2. Utilise the space in each page efficiently.

3. Known as parallel keys.

4. They will group taxa.

5. Do not give visual presentation of group.

Indented key-

1. Two leads of each couplet separated by each couplet and difficult to comaprison.

2. There is wastage of water.

3. Known as yoked keys.

4. They wont group taxa.

5. They give visual representation of group.