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BUCKTHORN Rhamnus cathartica (Rhamnaceae) Height to 8m. Deciduous, thorny shrub or small tree. Found in woodland and scrub, mainly on calcareous soils. FLOWERS are 4-5mm across and greenish yellow; borne in clusters (May). FRUITS are berries that ripen black; borne in clusters. LEAVES are 3-6cm long, oval, finely toothed and opposite. STATUS-Locally common in E England only.