Two peony flowers: one white with pale green veins, petals open to reveal red stamen and yellow pollen; and one pale pink with red veins, closed, round. Dark green leaves. Paeonia obovata. Yama shakuyaku. Colour-printed woodblock engraving by Kan'en Iwasaki from "Honzo Zufu," an Illustrated Guide to Medicinal Plants, 1884. Iwasaki (1786-1842) was a Japanese botanist, entomologist and zoologist. He was one of the first Japanese botanists to incorporate western knowledge into his studies.