Calyptridium quadripetalum, synonym Cistanthe quadripetala, is a species of flowering plant in the family Montiaceae. It is also commonly known as the four-petalled pussypaw.https://www.inaturalist.org/taxa/75962-Calyptridium-quadripetalum It is endemic to the North Coast Ranges of California, where it is an uncommon member of the serpentine soils flora on the slopes. It is a small annual plant spreading or erect stems each a few centimeters long. There is a basal rosette of small, thick leaves and a few along the stems. The inflorescence is a dense cluster of sepals and four white to pink round petals.
References
External links Jepson Manual Treatment Photo gallery