Threadleaf Phacelia (Phacelia linearis)
More attractive than the previously posted hastata (admittedly not saying much), the threads must refer to the tiny hairs on the needle-like leaves.
The genus name comes from the Greek phakelos, which means “cluster,” referring to the crowded groups of flowers on many species (including this one). This annual plant is common in dry, grassy hills in the west. We find these in the eastern gorge in the springtime. Most sources report that this variety grows larger and more colorful in wet springs.