The directory gives in alphabetical order the Latin names of genera and species of ornamental herbaceous plants used in open ground and capable of being cultivated on the territory of the USSR. Russian plant names, the most common synonyms and some brief additional information about the geographical distribution, dates of first introduction, and others are also given. The book aims to help streamline the naming of ornamental plants. It is designed for scientists, specialists and practitioners in the field of decorative gardening and floriculture, as well as amateur florists.