Herb Book by John Lust
A handy reference for any herbalist, The Herb Book by John Lust compiles a wealth of herbal information under many different indexes.
There is an appendix for finding plants by their common, or folkname; an index by ailment that lists herbs that can help; a chapter on techniques and different modes of herbal preparations; and the bulk of the book is an encyclopedia of herb knowledge, sorted alphabetically.
Each plant entry includes a black and white line drawing.