What flowers grow well in alkaline soil?

Blueberries are the single most important crop in America that depends on acidic soils. These shrubs are derived from wild plants related to the American huckleberry which grow in the acidic soils of our nation's forests. There the accumulated litter of needles and decaying leaves can cause a more neutral soil to become acidic. Soils in areas of high rainfall can be naturally acidic as is the case in the Pacific Northwest, home of the largest blueberry growing region.

The links below detail the profile of a modern blueberry hybrid. In addition, an article on how to grow blueberries details more on their soil preferences.