A milkweed on the greenway

I'm thinking this is swamp milkweed, Asclepias incarnata.  I haven't ever bothered to really learn all of the milkweeds and their specific characteristics -- there are actually quite a few species out there, although only a few "in cultivation."

This one is along the Weaver Boulevard greenway in Asheville -- quite lovely. 

I admired the common milkweed at Beaver Lake again this morning -- covered in honey bees, flower flies, and skippers.