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dogwood, (genus Cornus), genus of shrubs, trees, and herbs in the dogwood family (Cornaceae), native to Europe, eastern Asia, and North America. Several are cultivated for their attractive flowers, and a few shrubby species are planted for their variegated leaves and colourful twigs—which can be red, purple, or yellow—and as food for game. The wood is very hard and nearly devoid of visible grain. Many dogwood species spread clonally by underground rhizomes or rooting branches....