How to use a Dichotomous Key
A dichotomous key is a tool to assist the user in identifying something and
contains a series of choices that lead the user to the items correct name.
Dichotomous means divided into two parts. A dichotomous key always has two
choices or couplets in each step. Begin by thoroughly reading each couplet. Then
decide which couplet describes the item in question. At the end of each couplet
will be either a name of the item or a number that indicates the next couplets that
need to be read. The user continues until the item is identiied