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HEDGE MUSTARD Sisymbrium officinale (Brassicaceae) Height to 90cm. Tough, upright annual or biennial of waste ground and disturbed soil. FLOWERS are 3mm across with 4 yellow petals; in terminal clusters (May-Oct). FRUITS are cylindrical, 1-2cm long and pressed close to the stem. LEAVES are variable: lower leaves are deeply divided while stem leaves are narrow. STATUS-Widespread and common throughout.