To identify new potential anti-influenza compounds, we isolated six flavonoids, 2'-hydroxyl yokovanol (1), 2'-hydroxyl neophellamuretin (2), yokovanol (3), swertisin (4), spinosin (5), and 7-methyl-apigenin-6-C-β-glucopyranosyl 2″-O-β-d-xylopyranoside