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The word polygonia could not be parsed. Trying a normal dictionary lookup:
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pŏlygŏnĭum, ii, v. polygonos.
† pŏlygōnĭus, a, um, adj., = πολυγώνιος, having many angles, polygonal: turres, Vitr. 1, 5.
† 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.