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THALE CRESS Arabidopsis thaliana (Brassicaceae) Height to 50cm. Distinctive annual of dry, sandy soils; often on paths. FLOWERS are 3mm across with 4 white petals; in terminal clusters (Mar-Oct). FRUITS are cylindrical and 20mm long. LEAVES are broadly-toothed, oval and form a basal rosette; upright flowering stems also bear a few, small leaves. STATUS-Widespread and fairly common in lowland areas.