Lysimachia nummularia
From Nearctica
Alien: Native of Europe.
Identification: A creeping, prostrate plant. Flowers yellow, with 5 petals, arising in pairs from the leaf axils on short flower stalks. Stem prostrate. Leaves round, shiny, in opposite pairs.
Distribution: Throughout eastern North America. Also occurs along the Pacific Coast.
Habitat: Moneywort is found on wet ground in disturbed areas including roadsides, ditches, and lawns.
Flowering period: July to September.