Persicaria glabra, also known as denseflower knotweed, is a species of flowering plant native to North America and Eurasia.
Description It is similar in appearance to P. longiseta and P. lapathifolia. The plant is a medium-sized perennial herbhttp://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242100093 with red, swollen joints and lanceolate leaves. The inflorescence is a dense raceme of small pink or white flowers, the fruit a flattened black nut.
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