Dictamnus fraxinella, as the burning bush is known to botanists, is a herbaceous hardy perennial. 2 to 3 ft. high. It bears alternate pinnate leaves and purplish red-veined flowers in summer, and has a pronounced and agreeable odour. During hot weather the plants exude a volatile, inflammable oil which may ignite if a lighted match is put to it. If stock is wanted, it is best to break up one plant only and use small portions of the fleshy roots.