Polygonum argyrocoleon
Polygonum argyrocoleon, with common names silver-sheath knotweed 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 Southwestern [United States|Southwest], and northwestern Mexico.
Polygonum argyrocoleon is an annual herb up to tall. It has very small leaves rarely more than long.