Field Guide to the Grasses, Sedges and Rushes of the United States
Edward Knobel
Concise descriptions and accurate line drawings of over 370 of the most common species, with an emphasis on wild plants in the eastern and central United States.
Dover Publications.
To select from a dropdown list of genera, type only the first 2-3 letters.
If "briar" doesn't deliver the results you want, try an alternate spelling such as "brier", etc.