Rockii tree peony with the following characteristics: single, lotus-shaped flower in milky white with dark purple nails at the base of the petals and golden yellow stamen. Very intense scent. Tall, broad shrub with vigorous, upright growth; it can exceed 2 m in height and in diameter. Originally from Gansu, an inland, mountainous region in China, it is the variety of the species that is most similar to the wild species. Late flowering.