Some color photos and line drawings accompany discussion and there are indices by common and and plant name. Clausen, Ruth Rogers and Nicholas H. Ekstrom. Perennials for American Gardens. Random House, 1989. This reference book helps in choosing, cultivating, and identifying perennials.
Colored photographs are plentiful and there are indexes to access common and Latin names.
Their Identification, Ornamental Characteristics, Culture, Propagation and Uses. Stipes Publishing Company, 1998. Clear line drawings portraying the characteristics of leaf, bud, and stem accompany the extensive information presented for hundreds of species and cultivars. John Wiley and Sons, 1997. Landscape designers and amateurs can refer to this valuable tome for plant materials for specific sites and landscapes.