Berberis crataegina is a bush about 6 feet high with short thorns that blooms from May to June with many clusters of 6 to 15 yellow flowers. The berries are first red and then turn black.Throughout Nouthwestern Asia on stony slopes from 2,600 to 5,000 feet . In Northern Turkey , there occur varieties that have crossed with the European barberry, Berberis vulgaris, which grows there. It is characterized by hanging clusters of flowers. In Southwestern Turkey , Berberis crataegina is replaced by Berberis. cretica, which has only 4 to 10 flowers per cluster.