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biting knotweed (Polygonum hydropiper); sickle-weed (Polygonum hydropiper); smartweed (Polygonum hydropiper) | |||
marsh-pepper smartweed; water-pepper smartweed; water pepperwort (Polygonum hydropiper) | |||
red-knees (Polygonum hydropiper); water pepper (Polygonum hydropiper) | |||
water piper | |||
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water pepper; smartweed |