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I believe that this species of milkweed is Asclepias syriaca L.
I found these growing along the banks of the Zumbro River.
Spotted on Jun 26, 2011
Submitted on Jul 9, 2011
2 Comments
Your think might be correctly with
http://en.wikipedia.org/wiki/Asclepias_s...
I think it of following Milkweed
http://en.wikipedia.org/wiki/Calotropis