Grasses & Rushes And How To Know Them by Stanley C Johnson.
 
Illustrated with over 100 text drawings and a coloured cover design by the author. Part of the Nature Lovers Library series volume 12.
 
This little volume is meant to slip in your pocket when setting out for a leisurley ramble through woods and across meadows and helps you to identify the many different species of grasses and rushes you may come across on your walk.