Polygonum aviculare or common knotgrass is a plant related to buckwheat and dock. It is also called birdweed, pigweed and lowgrass. It is an annual found in fields and wasteland, with white flowers from June to October.

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Gewoon varkensgras (Polygonum aviculare) is een plant uit de duizendknoopfamilie (Polygonaceae).

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