Yellow flowers; root; seeds and leaves of Cheilocostus speciosus; Amomum arboreum Lour.; (Yakuchishi)Colour-printed woodblock engraving by Kan'en Iwasaki from 鈥楬onzo 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.