This guide addresses the challenge of identifying non-flowering and grass-like plants in the field by providing a comprehensive, visually-driven classification system. The authors, Alastair H. Fitter, Ann Farrer, and Richard Fitter, leverage their botanical expertise to synthesize complex morphological data into an accessible format for both amateur naturalists and professional field researchers. The text utilizes a structured identification framework that prioritizes observable physical traits to distinguish between closely related species across diverse European habitats.

The work is regarded as a standard, reliable reference for field identification due to its systematic approach and focus on visual diagnostic features. Its utility is bolstered by the authors' ability to condense technical botanical terminology into a format suitable for practical use in varied outdoor environments.