Henry A. Gleason authored this botanical guide in nineteen eighteen to provide a practical method for identifying plants throughout Michigan. The work is explicitly designed for non-experts, intentionally omitting dense academic descriptions in favor of accessible identification keys.
The system relies entirely on visible structural features such as leaf arrangement, floral parts, and stem characteristics. Users follow a numbered sequence of contrasting descriptions, systematically narrowing down possibilities from major plant groups to specific families, genera, and species.
The text prioritizes features observable without a magnifying glass or flower dissection. It categorizes plants into major divisions like woody plants, unusual forms, monocotyledons, and dicotyledons, guiding the user progressively through each stage.
While scientific names and Latin derivations are provided for precision, common English names are included for most species to accommodate casual observers. Standard botanical manuals are referenced for advanced study, making the book a bridge between casual interest and systematic botany.
