The dwarf peony belongs with peonies, not buttercups. That distinction is more than a change of label: it reflects a shift from sorting plants by visible resemblance to tracing their evolutionary ancestry. Once grouped with buttercups in Ranunculaceae, peonies now occupy a family of their own, Paeoniaceae.The old resemblance was persuasive but incomplete. Peonies and buttercups share conspicuous f...More