CYNOSURUS, in botany, a genus of the triandria digynia class. The calix is a double valve, and includes many flowers. There are ten species, four of which are natives of Britain, viz. the cristatus, or crested dog-tail grass; the echinatus, or rough dog-tail grass; the cæruleus, or blue dog-tail grass; and the panicus, or bearded dog-tail grass.