Includes a broad introduction highlighting the rationale of publication of this series, a dichotomous key for identification of all families of higher plants and treatment of the divisions Lycopodiophyta, Equisetophyta, Polypodiophyta, Pinophyta, and Magnoliophyta, in part (Poaceae). It covers 27 families, 167 genera and 650 species and subspecies and 35 illustrations.