DRAGON'S HEAD; a genus of the gynoecpermia order, belonging to the diandria class of plants. There are 13 species, most of them herbaceous, annual, or perennial, plants, from 18 inches to three feet high, garnished mostly with entire leaves, and whorled spikes of small monopetalous and ringent flowers of a blue, white, or purple colour. They are all easily propagated by seeds, which may be sown either in the spring or autumn, and after the plants are come up they will require no other culture but to be kept clear from weeds.