Prepared by Jennifer L. D’Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated April 2019. Scientific name: Persicaria maculosa S.F. Gray; also Polygonum persicaria L. Common name(s): spotted ladysthumb, redleg, gambetta, redshank, lady’s-thumb smartweed Links: USDA PLANTS Profile, Go Botany Images: (to see enlargements [PC]: click on image, then right click and choose “view