Alison Graff & Georgina Jolliffe 
American Herbal Pharmacopoeia [PDF ebook] 
Botanical Pharmacognosy – Microscopic Characterization of Botanical Medicines

Winner of the James A. Duke Award for Excellence in Botanical Literature Award from the American Botanical Council Compiled by the American Herbal Pharmacopoeia, this volume addresses the lack of authoritative microscopic descriptions of those medicinal plant species currently in trade. It includes an atlas providing detailed text and graphic descri