Zizia aurea, in captivity. Golden Alexander is a host plant but the females will only lay on the tender new growth... once they're done flowering they're pretty much done growing, thus this is only a spring time host plant. The caterpillars are happy to eat it all the same.
Also note the meadow garden in the background. I haven't been updating over the summer that much because the orange coneflower, Rudbeckia fulgida, and butterfly weed, Asclepias tuberosa, weren't as showy overall. The Sky Blue Asters, Symphyotrichum laeve, and Symphyotrichum azureus are starting to fill in nicely against the Showy Goldenrod, Solidago speciosa, and Coreopsis tripteris. The two aster species look way to similar to really tell apart, but that's okay as S. laeve tends to bloom a few weeks sooner than S. azureus, creating the illusion of a prolonged bloom.