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annual growing to 1.5 metres tall; stems usually flattened in cross-section at the base; smooth leaves often purplish at the base; flowers covered with short, stiff hairs and often a straight or twisted bristle (awn) |
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can produce over 1 million seeds |
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can remove as much as 80 percent of nitrogen from the soil
Photo courtesy Dean Swan, Washington State
University (retired)
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