I returned to the milkweed patch to get a photo of this milkweed. It is whorled milkweed, a very small milkweed about 1/3 the size of common milkweed. The flowers are tiny! Without the macro lens I wasn't sure it was a milkweed, though the caterpillar indicated otherwise. As for caterpillars? There were none today. Drat ... I was really hoping I might be able to observe a chrysalis.