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Agriculture in Dry Lands: Principles and Practice (Developments in Agricultural and Managed-forest Ecology 26) . By I. Arnon. Amsterdam: Elsevier (1992), pp. 980, £309.00. ISBN 0-444-68912-4.

identification. Refreshingly, the authors do provide a section on the shortcomings of descriptions generated in this way and they list references and data sources used in compiling the descriptions in the database. This is a major compilation and the result of an enormous amount of careful and thoughtful work. It will be a useful source of reference for all those professionally concerned with the grasses but will not obviate their need for other sources of taxonomic/systematic information about these plants.