|C. X regius 'Cynthia Postan' is more commonly known as 'Cynthia Postan' Ceanothus, see 'Cynthia Postan' Ceanothus for more information.Compact, low-growing, broad, evergreen shrub. Leaves are oblong, glossy, dark green and finely toothed up to 2 inches long. Dark blue flowers are borne profusely in large lateral cymes up to 3 inches long. Excellent for a shrub border or against a sunny wall.