Bird’s-foot Trefoil is one of those plants that is planted on purpose, but then escapes and becomes a bit of a nuisance. It is planted in cattle pastures to add a nice legume to the pasture mix. It grows better in poor soils than alfalfa and doesn’t cause bloat, whatever that is.
It’s a pretty flower, especially up close. It blooms from spring to fall. A lot of people like it and in northeast Indiana it seems to be confined to poorer soil, i.e. roadsides. I don’t see many native species along roadsides, so it isn’t really competing with our natives, just other foreigners.