Your search found 7 image(s) of stems of Joe Pye Weed species.
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Eutrochium maculatum var. maculatum
Stem dark purple or at least purple-spotted, per Wildflowers of the Southern Mountains.
Eutrochium purpureum var. purpureum
The stem is generally greenish but purplish at the nodes, per Wildflowers of the Southern Mountains.