[.ca] How to Draw Plants: The Techniques of Botanical Illustration (ISBN 0881923508)

all you ever needed to know!:
This book really has all you ever needed to know about botanical illustration - history, mediums, styles, scientific considerations, and more. A must for anyone going into this field.

The best introductory book on the subject:
The book examines plant structures and the problems they present to illustrators, then discusses the artist's tools and how to use them: pencils, erasers, papers, brushes, watercolors, gouache, and acrylics.

For those with some experience, Technical Drawing:
This book focuses on technical drawing as the basis of botanical illustration. It brings together an understanding of plant structure with drawing technique as the keys to success. Selecting, preserving and examining plants is discussed. A variety of plant structures are shown in detail with the process of building up the drawing. Pencil, ink and scratchboard are the main media covered. The addition of color is presented in watercolors and acrylics. There are several beautiful color plates, some historical and some by the author. This is a book best suited to an artist with some experience. The wealth of technical information will provide the artist with a greater understanding of and proficiency in botanical work.