Info: Entire plant / 2014-05-29 / Peony Garden at Nichols Arboretum, Ann Arbor, Michigan / License: All rights reserved
Caption: P. rockii tree peony - A mature multi-trunk specimen of unknown age. It blooms at the same time as rhododendrons, flowering dogwood, redbud trees, and woodland wildflowers like wild geranium, mertensia, and trillium
