Latin name: Polygonum persicaria
  Family: Polygonaceae
  Common name: ladysthumb
  Life cycle: annual, spreading by seed
Habit: low growing, decumbent, circular mat
Foliage and stem: Leaves are linear in shape, often with a purple blotch in the middle. Stems are jointed at the nodes and surrounded by an ocrea.
Flower: Flowers occur in terminal spikes. Spikes are 1-2 inches long.
  Note: This field weed is one that is most often un-controlled in early summer. It germinates in June just as early spring herbicide applications have degraded to the point that weeds can successfully germinate. An early summer preemergence herbicide application would be beneficial for preventing this weed's establishment.

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