Here you can see the stemless habit that earns the 'tufted' common name, and 'caespitosa' specific. Tufted tends to grow in patches, making its displays even more compelling.
Western tribes used the roots and leaves as medicine, mostly to treat wounds and sores. Tufted evening-primrose was also used in ceremonies. The Navajo mixed it with corn meal and placed it on Nightway sandpaintings. The Hopi used it as a tobacco substitute.