Complementing the growing list of editions and translations which have appeared in the series Aristoteles Semitico-Latinus, this is the first critical edition of Adam of Bockenfield's commentary on the pseudo-Aristotelian treatise on plants. The leading Arts master at Oxford in the middle decades of the thirteenth century, Adam crafted a comprehensive and highly organized commentary, which enjoyed wide circulation on the continent. Professor Long's introduction also explores the relationship between Adam's commentary and the gloss that was the established classroom text at Oxford.