The desert dandelion,
malacothrix glabrata, is one of many white or yellow-bloomed aster (composite) species with ligulate flowerheads - each individual floret is formed of a strap-shaped corolla, with notches at the tip, and a style/stamen at the base. This species grows in dry, shady locations in the Mojave Desert, and eastwards into New Mexico. Flowers are often red at the center initially, becoming all yellow when fully mature.
Other species in the asteraceae family