This can be challenging because there is no comprehensive identification key, so focusing on only a few species at a time is important.

They are highly variable, making it impossible to provide a simple, diagnostic identification key for the subfamily.

Guides for students often introduce the concept of identification keys.

They are often used in field guides or identification keys.

It is designed for computer processing, allowing the generation of identification keys, diagnosis, etc.

Therefore, identification keys must be constructed with great care in order to minimize the incidence of such errors.

To decide which species a particular specimen belongs to, therefore, is likely to require a detailed examination with an identification key in hand.

The only identification key was a tattoo on the upper left chest.

Spend an afternoon with a dichotomous identification key and let the students identify the samples.

For each species, the information system includes more than just the identification key's comprehensive plant characteristics.