A tetraploided form of cl. montana rubens raised at the Boskoop Research Station in Holland in 1960. It has large leaves which are trifoliate, bronze green in colour maturing to deep bronze purple. The leaflets have deeply serrated edges. This attractive foliage offsets the large 7.5cm (3in) wide cup-shaped flowers. The four deep rosy-mauve tepals are rather thick and have a satin sheen, the centre is made up of a large cluster of deep yellow stamens.