As a former student of the late Dr. Harrington who taught me much about plant classification, I highly recommend this book. It is similar to his How to Identify Plants, but the diagrams are much better. It is a very thorough review of the morphology and terminology specific to sedges, rushes, and grasses. These are all very difficult families to identify and there are few books that so thoroughly describe the critical and unique morphology of these plants. This is a knowledge that is critical to the identification of these fascinating and important plants. Dr. Harrington also includes a section on the vegetative characteristics, especially of grasses. For field ecologists like myself, being able to identify plants without the flowers, especially grasses, is critical when doing quantitative sampling. If you are just a beginner in your pursuit of these difficult plants, this is an excellent and valuable resource. But for even the plant scientist this book provides an excellent reference to refresh your memory regarding the unique and important mophology of grasses, sedges, and rushes.