ornamental perennial plant of the poppy family (Papaveraceae) native to southwestern North America. It is one of two species of Hunnemannia and has large, four-petaled, sulfur-yellow flowers about 5 to 7.5 cm (2 to 3 inches) wide, with a central puff of orange stamens (male reproductive structures). Golden cup grows to about 30 to 50 cm (12 to 20 inches) in height. The bluish green leaves have many blunt, narrow segments.