African rue, Peganum harmala. A highly invasive perennial, exotic weed. Prefers disturbed habitats such as roadsides and vacant lots. Now established in parts of AZ, CA, MT, NM, NV, OR, TX, WA. Difficult to eradicate due to its resistance to herbicides and its deep root system. Photo Socorro Co., NM. It is a source of Harmine, a hallucinogenic alkaloid found in the seed coat; it is a reversible monoamine oxidase inhibitor.