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Silver-sheath knotweed, Persian knotweed
Polygonum argyrocoleon, 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 Southwest, and northwestern Mexico.[+]
Polygonum argyrocoleon is an annual herb up to 80 cm (31 in) tall. It has very small leaves rarely more than 5 cm (2.0 in) long.
Blooming silver-sheath knotweed (Polygonum argyrocoleon) in a roadside depression of Abu Samra Road in southern Qatar, February 11, 2014
Salwa Rd, Qatar
Flowers on terminal spikes of silver-sheath knotweed (Polygonum argyrocoleon) on a roadside of Salwa Road. Qatar, February 14, 2014
Salwa Rd, Ar-Rayyān, Qatar
Silver-sheath knotweed (Polygonum argyrocoleon or may be P. equisetiforme, local name qadab) in a depression near Salwa Road, south-west from Doha. Qatar, April 23, 2014
Salwa Road, Al-Kiranah, Qatar
QNHG (Qatar Natural History Group) and associated people, for a possibility to participate in their field excursions and to learn about local nature.