Exceedingly pretty flowers, with very slender, brown stems, often branching, from two to twelve inches tall, and a few, rather inconspicuous, dull green leaves. The flowers are an inch or more across, with a salver-form corolla, with a long slender tube, white and beautifully sheeny in texture, bordered with dull pink on the outside, showing where the petals overlapped in the bud; the stamens and pistil not showing in the throat. They have a strong and unpleasant odor, but the effect of the airy flowers is beautiful, especially in the desert, as they sway to and fro in the wind on their slender stalks. They open only in the evening, but stay open all night and keep on opening and closing for several days, getting larger as they grow older. This is common on open slopes and hills, but is variable and not easily distinguished from similar species.