Pale smartweed (Polygonum scabrum Moench).

Family: Polygonaceae Juss. 
Stem ascending, usually ramified, hairless, red spotted, up to 10-60cm
Leaves lanceolate.
Root system vertical root.
Propagation by seed. 800-850 seeds/plant.
Flowering period in summer - autumn.
Flowers - small, greenish white to pale pink, in erect cylindrical, terminal or axillary inflorescences. Each flower cluster grows up to 8 cm long (3.15 inch), 3 - 9 mm (0.12 - 0.35 inch) thick, nodding..
Fruit - achene, seeds egg-shaped, the size 2-3,2x1,5-2,5x0,5mm
Seeds germination in late spring. Seeds are lentiform, hard coated, shiny, black-brown. Seed germination depth up to 4cm.
Distributed everywhere, but mostly in the Polissya area.
To litter crops of spring and winter crops, flax, beets, grows in gardens, on gardens, on meadows.