Northern Prairie Wildlife Research Center
On the back of each page is one or more colored photograph(s) of the species and a map showing the distribution of the species in the United States. The distribution map was compiled after consultation of all existing floras of the United States. The map gives only a general range of the species. A state which is completely covered by the pattern does not necessarily mean that the plant occurs in every county, although it might be expected in every county.
The remainder of the back page is devoted to a description of the plant, including characteristics of the habitat in which it is found, the growth form, stems, leaves, flowers (sepals, petals, stamens, pistils), and fruits. Useful or other features of the plant are included under Notes. Since the most frequently used recent general flora for the northeastern states is Manual of Vascular Plants of Northeastern United States and Adjacent Canada, Second Edition, by Gleason and Cronquist (The New York Botanical Garden, 1991), any plant names used in that book that differ from the names used in this manual are given under Notes.
To use the guide, one identifies the plant to group, either with the key or from experience and prior knowledge, and then refers to the plant description. If the plant is not encountered in the descriptions, it is not covered by this guide, and the investigator must consult other references.