This lovely little flower is a Chameleon Plant. It comes from Asia and is very invasive. An article from Southern Living magazine says that the only way to get rid of it is to "Set off a tactical nuclear weapon in your garden. Pave over your garden with a foot of concrete."(see here)
We found it growing wild on the banks of a wetland. It has already invaded!
This bee was so big he had trouble hanging onto the blue vetch flowers. The vetch is not native to North America, but it has become common in wild areas.