This large, dandelion-looking flower is yellow salsify (Tragopon dubius), also called western salsify, although it is native to Europe and Asia. It is now common throughout most of the U.S.
The flower is quite pretty and later produces a huge dandelion-looking seed pod. 
This pretty, low-lying flower with large yellow blossoms is a member of the Evening Primrose Family (Onagraceae), and is Howard's Evening Primrose (Oenothera howardii). 
Like other evening primroses, the flowers open for just one evening, when they are pollinated by moths. Then the flower wilts away, its job done.
This is a good plant for xeriscaping. For more information about Howard's evening primrose, click here. 
This striking flower is Colorado Blue Columbine (Aquilegia coerula), a member of the Buttercup Family (Ranunculaceae). The flower shape is similar to Western Columbine (Aquilegia formosa), but the size of the flower is much larger and the color is not red, but rather white or blue or most frequently, a mixture of the two. 
Part of the reason the flower appears so large is that the sepals (the part underneath the flowers) are also brightly colored and protruding.
Small clusters of grayish-green leaves on the forest floor might be puzzling at first, but when the flowers emerge, it isn't hard to tell that this plant is Littleleaf Pussytoes (Antennaria microphylla), also called Rosy Pussytoes. It's a member of the Sunflower Family (Asteraceae). 
A closeup of the flower shows the pink bracts surrounding the white disk flowers. 
Watson's Penstemon (Penstemon watsonii) is probably the most abundant penstemon in this area. 
Watson's penstemon has hairy stems but smooth corollas (flower tubes).
Penstemons are such interesting looking plants. This genus even has its own fan club: the American Penstemon Society.
Growing along stream margins and wet meadows is this one-to-twofoot-tall plant with white flowers. Upon closer inspection you can see that the flowers have four petals, a clue that it's in the Mustard Family (Brassicaceae). The heart-shaped leaves are referred to in both the common and scientific names: Heartleaf Bittercress (Cardamine cordifolia).
The desert is not a place one often associates with orchids, but at least a couple species are present, including summer coralroot (Corallorhiza maculata), also called spotted coralroot.
Looking closer at the small flowers, you can see it definitely has an orchid appearance. The spots on the lower petal are referred to in the species name "maculata," which means spotted.
