Hairy rose mallow produces large blooms, up to 6" across, in shades of white to pink. It is a North American native wildflower.
Hibiscus lasiocarpus has lots of common names, including Delta Hibiscus, Sacramento Rose Mallow, River Mallow and Woolly Rose Mallow. It prefers rich, moist soil in full sun to light shade. Hardy in zones 4-10.