There were samples of buckthorn, acorns, ocotillo, nightshade and wild tobacco. Some southeastern groups planted corn and some encouraged the growth of wild tobacco. Nicotiana quadrivalvis is a species of wild tobacco known as Indian tobacco. Nicotiana glauca is a species of wild tobacco known by the common name tree tobacco. Nicotiana attenuata is a species of wild tobacco known by the common name coyote tobacco. Nicotiana clevelandii is a species of wild tobacco known by the common name Cleveland's tobacco. For example, wild tobacco plants use nicotine, a poison to defend against herbivores. Wild tobacco is native to the southwestern United States, Mexico, and parts of South America. Wild tobacco, which the Maya called 'piziet', also played a part in sacred ceremonies.