Volume 1: Trees & Shrubs Volume 2: Perennials & Annuals Combine botanical and horticultural knowledge - catalog with the botany books. Buds, pods, cones, fruits, flowers, stems, leaves & sometimes the undersides of leaves, organized & cleanly labeled on a white page, help us to see clearly what it is that distinguishes one plant from another. Covering more thean 500 genera per volume. Plants are arranged in evolutionary order & classified by family. The index appears to be thorough & accurate.