Author(s): JELITTO & SCHACHT
Here is the English translation of the world's greatest encyclopedia of perennial plants. Included are 809 genera; 4286 species, subspecies, varieties, and hybrids; and 3617 cultivars. It is a peerless resource for perennial one-upmanship because of its inclusiveness, and this translation offers material on new introductions. Some shelf wear.
""Hardy Herbaceous Perennials" easily has more useful information on herbaceous plant species and cultivars than my favorite 5 or 6 perennials books I usually use for reference."
--Michael Vassar, Herbertia, January 1996