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Keywords from Image Description:
taxonomybinomialpolygonum cespitosum var. longisetum taxonomybinomialpolygonumcespitosumvarlongisetum polygonum lady's thumb ladysthumb knotweed tufted knotweed tuftedknotweed invasive weed usgs biml droege lens purple upper marlboro uppermarlboro maryland texture macro depth of field bright black background shot of seed head of Tufted