Plant: Perennial erect shrub, branching from the base, 1 1/2 to 4 feet high. Common.
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Flowers: Yellow flower heads in dense terminal clusters, 1/4 to 3/8 inches high
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Leaf: Alternate on stems, linear to oblong, tipped with small spines 3/8
to 1 1/2 inches long. Upper leaves diminished, less toothier and often in small clusters.
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