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- course annual growing to 1 metre in height; leaves are
long-stalked with prominent whitish veins; taproot is often
pinkish to red; inconspicuous green flowers borne in spike-like
clusters in leaf axils and at stem ends; stiff, spine-like bracts
give the head a bristly appearance
- one of the most common agricultural weeds; can produce over
100,000 seeds/plant
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