This has a few large flowers, three inches or more across, with pure-white diaphanous petals, fading to pink, and pink calyx-lobes. The buds are erect, hairy and pink, and the flowers spring from a cluster of long, downy root-leaves, narrowing to slender leaf-stalks, with hairs on the veins and on the toothed and jagged margins, and have almost no flower-stalk, but the hairy calyx-tube is so long, sometimes as much as seven inches, that it looks like a stalk. The root is thick and woody and the capsule is egg-shaped and ribbed, with no stem. There is a patch of these wonderful flowers in the Grand Canyon on Bright Angel trail, halfway between the rim and the plateau, where in a shaded spot beside a great rock the pure blossoms seem to shed a moonlight radiance. They are equally beautiful on the dry plains of Utah, where they grow in quantities.

White Evening Primrose pachylophus marginatus.

White Evening Primrose pachylophus marginatus.

There are several kinds of Anogra, resembling Onagra, but with white or pink flowers and the seeds differently arranged; the stems often clothed with papery bark; the buds drooping. The name is an anagram of Onagra.