by Flückiger, Friedrich A. (Friedrich August), Hanbury, Daniel
Read "Pharmacographia: A history of the principal drugs of vegetable origin, met with in Great Britain and British India" by Flückiger, Friedrich A. (Friedrich August), Hanbury, Daniel for free. A classic public domain work covering botany, medical, materia medica, vegetable, materia medica, vegetable -- great britain. Available in full text from Project Gutenberg.