Archaeobotanical evidence of the spread of Fagopyrum (common buckwheat) in China during the 7th to 13th century ce - Xu Liu; Fei Zhang; Qi Wang; Zhenzhen Wang; HaoHong Cai; Shuhan Zhang; Yinlong Chen; Zhilong Jiang; Zhanwei Yue; Kai lv; Xuexiang Chen (Vegetation History and Archaeobotany, 2026)