Lithophragma genus --- Saxifrage family
bulbous woodland-star (Lithophragma glabrum) -- in June -- Cherokee Park Road, CO white & cream
smallflower woodland-star (Lithophragma parviflorum var. parviflorum) -- in June -- Steens Mountain WA, OR white & cream
slender woodland-star (Lithophragma tenellum) -- in May -- Black Canyon of the Gunnison National Park, CO white & cream