Does anyone know what this plant is? I remember one of these from a place I gardened at, and I never found out what it was (or got a part of it, drat it) It's about chest high, looks like a heliopsis or coreopsis, but has a divided leaf like something from the clematis/trollius/ranunculus family. It doesn't take much care; the one I saw had been untended for years and from the looks of this picture, neither has this one. Thanks!