The book investigates the geographical distribution and geological history of plant life in British North America. It examines the physical characteristics of these plants and their past geological relationships, providing a detailed account of botanical evolution and distribution within the region.

This work is likely to be of significant interest to botanists, geologists, and ecologists specializing in North American flora and paleobotany. The detailed examination of distribution and geological history suggests a comprehensive and scholarly approach. Its focus on the interplay between physical environments and plant evolution positions it as a valuable resource for understanding the region's natural history.