[Ceris canadensis] Forma alba has white flowers.
‘Royal White’ is a white-flowered cultivar noted for its pure white flowers. ‘Royal White’ was discovered in 1940 by Royal Oakes of Bluffs, Illinois, as a seedling from a native tree. It is uncommonly found in commerce. The more common white redbud found in commerce is C. canadensis f.[ for Forma] alba. In comparison to C. canadensis f. alba, ‘Royal White’ is a more compact tree, blooms earlier, is more floriferous and produces larger flowers. ‘Royal White’ is synonymous with and sometimes called ‘Royal’.
