Book excerpt: Volume 1: The History and Practice of Indigenous Plant Knowledge Volume 2: The Place and Meaning of Plants in Indigenous Cultures and Worldviews Nancy Turner has studied Indigenous peoples' knowledge of plants and environments in northwestern North America for over forty years. In Ancient Pathways, Ancestral Knowledge, she integrates her research into a two-volume ethnobotanical tour-de-force. Drawing on information shared by Indigenous botanical experts and collaborators, the ethnographic and historical record, and from linguistics, palaeobotany, archaeology, phytogeography, and other fields, Turner weaves together a complex understanding of the traditions of use and management of plant resources in this vast region. She follows Indigenous inhabitants over time and through space, showing how they actively participated in their environments, managed and cultivated valued plant resources, and maintained key habitats that supported their dynamic cultures for thousands of years, as well as how knowledge was passed on from generation to generation and from one community to another. To understand the values and perspectives that have guided Indigenous ethnobotanical knowledge and practices, Turner looks beyond the details of individual plant species and their uses to determine the overall patterns and processes of their development, application, and adaptation.