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RAY’S KNOTGRASS Polygonum oxyspermum (Polygonaceae) Prostrate. Mat-forming annual of undisturbed coastal sand and shingle beaches. FLOWERS are pinkish white and arise in leaf axils (Aug-Sep). FRUITS are nut-like and protrude beyond the withering flower. LEAVES are oval, leathery and alternate, sometimes with slightly inrolled margins. STATUS-Local and commonest in W.