Armitage's Manual of Annuals, Biennials, and Half-Hardy Perennials
A fitting companion to Allan Armitage's book on perennials, Armitage's Manual of Annuals, Biennials, and Half-Hardy Perennials (Timber Press, 2001, $39.95) is not only comprehensively encyclopedic but also a great read. In 604 pages, Armitage covers 245 genera plus a great number of species and cultivated varieties. The book is illustrated with both color photos and line drawings.
Ketzel Levine's Talking Plants
Check out Ketzel Levine's Talking Plants Web site, where you can listen to and read archives of National Public Radio's "Doyenne Of Dirt." There are also plant profiles and links to resources.