This volume investigates the biological diversity and ecological significance of tree species native to or naturalized within the British Isles. Barbara E. Nicholson provides a comprehensive botanical survey, utilizing detailed observational data and historical context to categorize the physical traits and environmental requirements of various arboreal specimens. The work serves as a systematic reference for identifying trees through their seasonal variations and geographical distribution patterns.

Botanists and naturalists frequently cite this work as a reliable, foundational reference for regional dendrology. Experts highlight the clarity of the descriptive prose and the precision of the botanical data provided throughout the text.