CRATÆGUS, in botany, a genus of the icosandria digynia class. The calix has five segments, and the corolla five petals; the berry is below the flower, and contains two seeds. There are nine species, three of which are natives of Britain, viz. the aria, or white bean-tree; the torminalis, service-tree, or forb; and the oxyacantha, white-thorn, or hawthorn.