Are buttercups and dandelions the same in America as in Europe? Or is it like robins, where the same name is used for a completely different species of bird?

Where I live a few years ago the local council sponsored fundraising planting of daffodils by local groups, so that now for a short time every spring the bursts out into brillint gold and green. Then the daffodils die down - and a few days later, out come the dandelions, and it's like a second coming, they are just as pretty, and they planted thermselves.

Weed shall overcome!