Two are threadleaf (verticillata) types. I know that one of them is definitely ‘Moonbeam,’ and I think it is the one in the top picture here. It’s flowers are a pale, creamy yellow, measuring an inch and a half across, and the plant is fifteen to eighteen inches high.
Is this ‘Moonbeam’ Coreopsis?
Finally, my third clump of Coreopsis has broader leaves and larger flowers, most just over two inches wide. The flowers stand a few inches above the plant, between 18 and 24 inches high. It is rare that I see such a full bloom on this plant; in previous years, the woodchucks have nibbled many of its buds before they can open. Perhaps someone in Blogland has a better idea about these lovely flowers than I!