Diodella teres is a species of flowering plant in the coffee family known by the common names poorjoe and rough buttonweed. This annual plant is native to Mexico, Central America, South America, the West Indies and the southern of the United States from California to Florida as well as much of the central and northeastern United States from Kansas to Michigan to Massachusetts. The species is also naturalized in the Netherlands, the Canary Islands, Western Africa, Angola, China, Japan and Korea, India, and Madagascar.