Lewis & Short

pŏlygŏnos or -us, i, f., or pŏly-gŏnon, i (pŏlygŏnĭum, ĭi, Scrib. Comp. 193), n., = πολύγονος or -ον, a plant (called in pure Lat. herba sanguinalis or sanguinaria), knotgrass, Plin. 27, 12, 91, § 113; 26, 15, 90, § 158.