Several taxa of butterflies are collectively called the Sulphurs or Sulfurs: Coliadinae, a subfamily of butterflies commonly known as the sulphurs or yellows Dercas, a genus of Coliadinae commonly called the sulphurs Colias, a genus of Coliadinae commonly called the sulphurs (in North America) or clouded yellows (elsewhere) Phoebis, a genus of Coliadinae that is not itself called the sulphurs but that contains a number of species which are