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BLACK-BINDWEED Fallopia convolvulus (Polygonaceae) Height to 1m. Extremely common, clockwise-twining annual that both trails on the ground and climbs among wayside plants. FLOWERS are greenish and rather dock-like; they are borne in loose spikes that arise from leaf axils (Jul-Oct). FRUITS are nut-like and blackish. LEAVES are arrow-shaped and borne on angular stems. STATUS-Widespread and common.