Polygonum argyrocoleon, with common names silver-sheath knotweedBrako, L., A.Y. Rossman & D.F. Farr. 1995. Scientific and Common Names of 7,000 Vascular Plants in the United States 1–294. and Persian knotweed, is an Asian species of plants in the buckwheat family. It is native to Siberia, western China, Central Asia, and the Middle East. It has also become naturalized in parts of the United States, primarily the Southwest, and northwestern Mexico.Biota of North America Program 2014 county distribution mapSEINet, Southwestern Biodiversity, Arizona chapter photos, description, distribution map
Polygonum argyrocoleon is an annual herb up to tall. It has very small leaves rarely more than long.Flora of North America, Polygonum argyrocoleon Steudel ex Kunze, 1847. Persian or silversheath knotweed Flora of China, Polygonum argyrocoleon Steudel ex Kuntze, 1847. 帚萹蓄 zhou bian xu
References
External links Line Drawing from Flora Palaestina