Wild Phlox
(Phlox longifolia)

These plants grow on dry hillsides and along the sides of roads. Each plant usually has many blossoms. The blossoms can vary in color from white, through pink, to lavender. Each flower is about 3/4 inch in diameter.
This photo was taken in Red Butte Canyon, Salt Lake County, Utah. It is probably Phlox longifolia, because my reference books say that it is the most common here.

Hood's Phlox
(Phlox hoodii)

It is difficult to tell one species from another, but I am quite sure that this one is a different species, possibly Phlox hoodii. The blossoms on this plant are slightly smaller than the more common kind -- only about 1/2 inch across.
The photo was taken on a hillside in Tooele County, Utah.