Calyptridium roseum, synonym Cistanthe rosea, is a species of flowering plant in the family Montiaceae commonly known as rosy pussypaws.[1] It is native to the western United States from California to Wyoming, where it grows in forest and scrub.[2] It is an annual herb, often reddish or pink in color, producing stems just a few centimeters long.[1] The leaves are located in a rosette at the base and along the stems, and are up to 4 or 5 centimeters long. The inflorescence is a tiny cluster of white-edged thin sepals and two white petals, each no more than a millimeter long.[2]