Hymenoxys richardsonii (common names pingue hymenoxys and pingue rubberweed) is a North American species of plants in the sunflower family. It is widespread across the western United States and western Canada from Arizona, New Mexico, and western Texas north as far as Alberta and Saskatchewan. Varieties * Hymenoxys richardsonii var. floribunda (A.Gray) K.F.Parker - Arizona, Colorado, New Mexico, Texas, Utah * Hymenoxys richardsonii var. richardsonii - Alberta, Saskatchewan, Colorado, Montana, North Dakota, Utah, Wyoming