"This text [of An illustrated flora of the Northern United States, Canada, and the British possessions, by Nathaniel Lord Britton and Addison Brown] has been entirely rewritten and new material added." Fourth printing of 1968 same edition as slightly revised third printing of 1963.

Vol. 1. The Pteridophyta, Gymnospermae and Monocotyledoneae, Lycopodiaceae to Orchidaceae, Clubmoss to Adam-and-Eve -- Vol. 2. The Choripetalous Dicotyledoneae, Saururaceae to Cornaceae, Lizard's-tail to Cotton Gum -- Vol. 3. The Sympetalous Dicotyledoneae, Clethraceae to Compositae, Sweet Pepper-bush to Goat's Beard. Attempts to describe all known species of native and successfully introduces seed plants, ferns, and fern allies. Intended "for the interested laity rather than the professional botanist."--Pref. A glossary defines the more technical terms used in the text. For each species gives description, variant names, common name, habitat and range, and illustration. v.1-2 divisions, classes, subclasses, orders, families, genera and species, and English names.