International audienceThe XIIIth century was an important turning point for the history of natural science in the medieval West, in particular by the development of the observation, as the scientific work of the Dominican and the theologian Albert le Grand (†1280 ) shows it. In the botanical field, in particular, he composed an impressive treatise De vegetabilibus which the VIth book lists and describes a large number of plants. This work was also a commentary on a pseudo-aristotelician text, and the knowledge and description of the vegetal world by Albert was not unprecedented. We wonder in this study if the german Benedictine abbess Hildegard of Bingen († 1179 ), can be counted among Albert's predecessors. In spite of the differences sepa...