Numerous small purple flower heads mark Canada Thistle, a species that spreads via underground stems and is very difficult to eradicate.
European Gromwell's tiny white flowers are open
The lacy pyramidical flower clusters of Smooth Sumac top roadside thickets and openings in the woods.
John
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| Canada Thistle |
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| European Gromwell |
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| Smooth Sumac |
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