This important book, written by C.A. Gardner after 30 years of field study and several years of preparation, deals with 420 species of grasses of which over a hundred have been provided with a plate, by which the habit and important details are shown. Especially the drawings of various parts of the spikelets are very skilful, instructive, and of the utmost importance for students of critical genera. There is an introductory part giving a general survey of the grass vegetation of W. Australia. It is a revelation to see that so many introduced and naturalised species had to be included; this striking invasion of 132 species affects a great change in the original vegetation.