RoulettiPrior to 1818 2 to 3 feet A very dwarf shrub with a continuous display of small, but nicely shaped, double, lilac pink flowers less than 1 2 inch across. One of the varieties of R. chinensis minima, 'Rouletii' was discovered rather far from its native ground, growing in window pots of cottages in a Swiss village. This diminutive plant is excellent as a low border, and an obvious natural for containers.