Growing on similar habitat to Cistanthe umbellata (Calyptridium umbellatum) but with a smaller overall range you will find Cistanthe monosperma (syn. Calyptridium monospermum). This Cistanthe's population is concentrated along the Sierra Nevada, Klamath, Siskiyou and Steen mountains. It looks for all practical purposes the same as C. umbellata with subtle differences (One that is observable with the naked eye, it's leaves are darker green and more slender) and requires the same culture in the garden.
http://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=1344
http://plants.usda.gov/java/profile?symbol=CIMO5
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242415717
