Lithophragma

Lithophragma is a genus of flowering plants containing about nine species native to western North America. These plants are known generally as woodland stars. The petals of the flowers are usually bright white with deep, long lobes or teeth. Each petal may look like three to five petals, when at closer inspection the lobes fuse into a single petal at its base. Most species reproduce via bulblets instead of seeds. "L. maximum" is a federally listed endangered species. "Lithophragma" specifically coevolved with moths of the genus "Greya", who pollinate and only lay eggs on "Lithophragma" plants.
Species.
There are 9 species. The Flora of North America North of Mexico counts 10 species, elevating "L. parviflorum" var. "trifoliatum" to species status, but the Jepson Manual considers it to be a variety of "L. parviflorum" restricted to California.