Utilization of Wild Edible Plants by the Tai Yoy Ethnic Group in Akat Amnuai District, Sakon Nakhon Province, Thailand

Wild edible plants (WEPs) play a crucial role in sustaining local food systems, cultural heritage, and livelihoods in northeastern Thailand. This study documents the diversity, cultural significance, medicinal use, and economic value of WEPs among the Tai Yoy community in Akat Amnuai District, Sakon Nakhon Province. Field surveys, interviews, and market observations recorded 78 species belonging to 42 families, with 52 species represent new records for the province. Fruits and leaves were the most commonly used parts, while multifunctional species such as <i>Curcuma angustifolia</i> Roxb., <i>Phyllanthus androgynus</i> (L.) Chakrab. & N.P.Balakr., and <i>Spondias pinnata</i> (L.f.) Kurz were highly valued for both dietary and medicinal purposes. Quantitative analyses, including the Cultural Food Significance Index (CFSI), fidelity level (FL), and Jaccard's similarity index (JI), revealed strong cultural consensus on key species and regional patterns shaped by ecological and sociocultural factors. Market surveys identified 25 species contributing to household income, highlighting the economic importance of WEPs and the potential risks of overharvesting. The study emphasizes the need for sustainable management, including cultivation of high-demand species, to reduce pressure on wild populations while supporting food security and traditional knowledge. These findings provide a comprehensive baseline for future ethnobotanical research, conservation planning, and the sustainable use of WEPs in northeastern Thailand.