Hymenoxys richardsonii (Hook.) Cockerell

Hymenoxys richardsonii (Hook.) Cockerell. Hymenoxys richardsonii, the pingue hymenoxys or 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.VarietiesHymenoxys 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