var. microphylla Rehd. & Wils
This variety is distinguished from the type by its smaller, less downy leaves, glabrous calyx, and denser habit. Introduced by Wilson from W. China in 1908, under W.1016. Many of the plants cultivated in Britain belong to this variety, which is linked to the type by intermediates and perhaps hardly worth distinguishing.O. schweriniae
is a characteristic member of the vegetation of the hot, dry, river valleys of W. China and needs a very sunny position in well-drained soil. The Wilson introduction (var. microphylla
) is hardy in such a position, even without the protection of a wall.