Manual describing all the flowering plants and vascular cryptograms, both native and naturalized, occurring within the borders of B.C. Keys are included for all genera, species, subspecies and varieties. The study is based on examination of specimens in all major Canadian herbaria and some U.S. herbaria, as well as a complete review of the pertinent literature. The floristic treatment is in alphabetical order by families, genera and species and provides information on synonyms, common names, habitat and moisture regime, vegetation zones, abundance, and range.