is one of several of species of yampah that are all very similar; the inflorescence is an umbel of spherical clusters (numbering from 12 to 27)borne on short, greenish stems (pedicels) radiating from the top of the main flower stalk, which together form a larger spherical cluster. Some specimens have longer pedicels (up to 5 cm) so that the individual clusters are further apart, while others have clusters that form a flat-topped arrangement. Leaves of Bolander's yampah, which grow mostly around the base, are long and thin, pinnately divided into a small number of lobes.
Each white flower is very small, about a quarter of an inch across, with five petals and five stamens that protrude slightly. Beneath each individual cluster are between three and eight short, linear bracteoles, while the whole inflorescence may be subtended by one or two bracts, similar to the bracteoles in appearance.