A detailed dictionary of plants, descriptions, recording their medicinal and other properties, and an appendix with possible names of plants that Theophrastus describes without mentioning their names.

Theophrastus, from Ereso in Lesbos, was born around 370 BC. He studied at the Platonic Academy and was friends with Aristotle. After the Stagirite fled Athens (323 BC), he succeeded him as the director of the Lyceum. He taught numerous students, including Menander, Demetrius of Phalerum, and Deinarchus. He died at an advanced age in 287 BC.

His works, both thematically and in terms of titles, refer back to Aristotle, whom he generally followed. He dealt with all areas of natural science as well as philosophy, rhetoric, and political thought. From his philosophical works, we have few fragments, but a large part of his botanical writings and the 'Characters' are preserved.

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