Peonies, The Manual of the American Peony Society, edited by James Boyd © 1928 American Peony Society: [Check List of Chinese Peonies in Commerce] Japanese Peonies, page 61
Purple Cup. (Kelway, before 1915.) Cherry-red.
PURPLE CUP (Kelway, before 1913) - Jap. - Cherry-Red - Midseason.
