blades ± silvery to white or gray-green, rounded-deltate or deltate to triangular-deltate, 5—25 × 3—15 cm, bases ± cordate, margins entire, apices acute to attenuate, faces sericeous, tomentose, tomentulose, or velutinous (at least abaxially, usually gland-dotted as well), sometimes glabrescent.
usually borne singly, sometimes 2—3+.
hemispheric to turbinate, 12—25 mm diam.
lanceolate to oblance-olate or linear, (15—)20—25(—30+) mm, equaling or surpassing inner, apices acute to acuminate.
grows east of the Cascade-Sierra axis to the Rocky Mountains and Black Hills. It is one of the more spectacular of all spring-flowering plants in the northwestern United States. Hybrids occur along lines of contact between