 The flowers are 3.5–5 cm diameter, with five lobes on the corolla; color varies from white to pink, often with a yellow blotch.There is considerable diversity in the form and appearance of this species, with genetic diversity seeming to reach its highest level along the coast in the vicinity of the border between Oregon and California.It is tolerant of serpentine soils to the point that serpentine soils (along with surface water) can be used as a sign of its presence in southern Oregon.