Family: Polygonaceae
Common name: Knot grass
Eco& Biol. Perennial.
Roots: A tap root, penetrating deep.
Stem: upto 100 cm tall, numerous, horny branched, semi-spreading, almost like a bush near maturity, almost spherical, hairless or sometimes short hairs along ribs.
Leaves: oblong, linear, lanceolate, pointed on both sides, sometimes short hairs, 5-12 cm long, 7- 25 mm wide.
Inflorescence: raceme but looks like loose panicle, seeds - a nut, 4-7 mm
long. Propagation by seed.
Flowering time: July - August
Distribution: Common weed in steppe zone of Mongolia, both in cropped and uncropped areas.
Closely related weeds: P. valerii A. Skvorts. and P. alpinum All. Both species are shorter than P. divaricatum
Control measures: More competitive at later stages of crop growth. Integration of herbicides, nutrient management and timely irrigation is necessary for long season control in cereals.
Countries: China, Morocco
Back to Database of Weed Species in Crops and Countries
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