Swamp milkweed top-ranked monarch-butterfly caterpillar host plant on wet prairies and adjacent to ponds and streams in late summer, but tall-green milkweed tops on some drier prairies in September

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Swamp milkweed  aka Asclepias incarnata

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Asclepias hirtella aka  tall-greenmilkweed

Tall-green milkweed

Asclepias hirtella aka tall-green milkweed