This guidebook shows how the distribution of common forest plants changes across British Columbia's northern interior landscape due to variations in climate, terrain, and site & soil conditions. The guide contains information on 215 plant species or groups that occur in the major biogeoclimatic zones of the Prince Rupert, Prince George, and northern Cariboo forest regions. The information, arranged first by category of plant (trees; shrubs; dwarf shrubs, herbs, & ferns; grasses & sedges; mosses, liverworts, & lichens) then by scientific name, is in the form of grids that depict the predominant moisture & nutrient regimes where a species will most likely occur in old or mature forests. Also included are notes on indicator values and habitat associations. Includes index of common & scientific names.