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A deciduous shrub of vigorous, loose habit, 6 ft or more high; young shoots clothed with a dense white felt. Leaves lanceolate, wedge-shaped at the base, tapering to a long fine point, rather shallowly toothed, each tooth terminated by a short, abrupt, gland-tipped point; they vary much in size according to the vigour of the shoot, the largest being 8 to 10 in. long, 21⁄2 to 31⁄2 in. wide, the smallest 21⁄2 in. long by 1 in. wide; upper surface at first clothed with white down, becoming dark green and less downy with age; lower surface clothed with dense, white felt, like the young shoots. Panicles terminal on the shoots of the current season, 8 to 15 in. long, 1 to 11⁄4 in. wide, densely crowded with very fragrant lavender-coloured flowers arranged in clusters on the main-stalk. Corolla 1⁄3 in. wide across the lobes, 3⁄8 in. long, the tube clothed with white felt outside; calyx 1⁄6 in. long, with sharp erect teeth, also felted. Blooms in late summer and autumn. Bot. Mag., t. 9564.
Native of Yunnan, China. At Kew it is scarcely hardy enough for the open ground, so is given a place on a wall; if cut to the ground, however, it will grow again from the base and flower from the new growths. It is not so rampant in growth as B. davidii and is allied to B. nivea, but is distinct botanically in having the stamens inserted about the middle of the corolla tube; in B. nivea they are inserted immediately below the mouth.