is most widespread all across the Rocky Mountains, and also occurs in most other mountain ranges of the West. It is a relatively tall species, up to 3 feet, and may be recognized by its basal leaves, which have a relatively sparse covering of split hairs, appressed to the surface, and also the cauline leaves, which have two backwards-pointing lobes at the base. Upper cauline leaves are hairless; lower stem leaves are also sparsely hairy. Stems are generally hairless, and they may have up to 50 leaves.
Flowers are arranged in an elongated cluster of (usually) up to 30, sometimes many more. Pedicels are hairless, and erect in fruit. Sepals are green, hairless, and relatively long, while petals are pure white, sometimes tinged with pale pink as they wither.