Parentage, Joseph Rock x Guardian of the Monastery. Hybrid tree, single white with pinkish tint at first, becoming white with large purple flares on each petal. Large cupped flowers, no fragrance. Pollen and pod fertile. First bloomed 1993. One bloom per stem, with flower held erect on strong stems, well above the foliage. Small leaf (RHS 127B) with small hairs on the underleaf. Cold hardy.