Calyptridium roseum

{{Short description|Species of flowering plant}}

{{speciesbox

|image = Cistanthe rosea.jpg

|genus = Calyptridium

|species = roseum

|authority = S.Watson

|synonyms = *Cistanthe rosea (S.Watson) Hershk.

}}

Calyptridium roseum, synonym Cistanthe rosea, is a species of flowering plant in the family Montiaceae commonly known as rosy pussypaws.{{cite book |editor-last=Hickman |editor-first=James C.|date=1993 |title=The Jepson Manual: Higher Plants of California |url=https://books.google.com/books?id=wAyG5J_7uOAC |location=Berkeley |publisher=University of California Press|pages=896–898 |isbn=978-0-520-08255-7}} It is native to the western United States from California to Wyoming, where it grows in forest and scrub.{{cite book |last=Dayton |first=William Adams|date=1960 |title=Notes on Western Range Forbs: Equisetaceae Through Fumariaceae |url=https://books.google.com/books?id=DokwAAAAYAAJ |location=Washington, D.C. |publisher=U.S. Department of Agriculture |page=117}} It is an annual herb, often reddish or pink in color, producing stems just a few centimeters long. 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.