As Heard on The Daily Gardener Podcast:
This is one of my favorite resources. Published back in 1997. Brand-new, this book is almost $200.
You can get used copies following the link in today show notes on Amazon for just under $8.
Describing 900 genera and over 8000 plants, this A-Z gardening encyclopaedia also introduces a way of identifying plants from their appearance alone. Hundreds of synonyms and common names are cross-referenced, and the book's coverage encompasses fruit, vegetables, herbs, house plants, flowers, foliage, shrubs and trees. The main benefits, uses and any drawbacks of each plant are pointed out, and there are instructions on cultivation, propagation and pruning techniques, and on dealing with pests and diseases.
SI HORTUM IN HORTORUM PODCASTUM IN BIBLIOTEHCA HABES, NIHIL DEERIT.