Knotweed
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seeds are edible.
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seeds can be eaten whole or pounded into meal.
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plants can be cooked and eaten.
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varieties in the Pacific Northwest include Common knotgrass (Polygonum aviculare), Common knotweed (Polygonum arenastrum) and Mountain knotweed (Polygonum douglasii).
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grows as a weed in a wide range, including dry areas, plains, and subapline regions.
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raw plants eaten in quantity may cause stomach upset and/or diarrhea.