Can anyone identify this plant?
I found this near I local creek in PA. I am hoping that it is a variety of Asclepias to feed my new monarch caterpillars. They seem to prefer the old leaves they arrived on and are ignoring this new foliage. Did I find the wrong plant? I'll try to attach pictures. These leaves came off of a plant around 4 feet high along the edge of the creek (not in the water).
Thanks for the help everyone!
Here is a link that might be useful: Alternate link to the pictures