Crassulaceae-feeder
Guides
Callophrys mossii
Moss's elfin, stonecrop elfin, Schryver's elfin
Callophrys mossii is a small North American butterfly in the family Lycaenidae, commonly known as Moss's elfin, stonecrop elfin, or Schryver's elfin. It is distributed in isolated populations from British Columbia south to southern California and east to Wyoming and Colorado. The species is univoltine, with adults active from March to June. Larvae are specialized feeders on stonecrop family plants (Crassulaceae), particularly Sedum, Sedella, Dudleya, and Parvisedum species. Multiple subspecies have been described, reflecting geographic isolation across its range.