He published his "Flora Japonica" in 1784, and in 1788 he began to publish his travels. He completed his "Prodromus Plantarum" in 1800, his "Icones Plantarum Japonicarum" in 1805, and his "Flora Capensis" in 1813. He published numerous memoirs in the transactions of various Swedish and international scientific societies. He was an honorary member of sixty-six scientific societies. In 1776, while still in Asia, he had been elected a member of the Royal Swedish Academy of Sciences. He was elected a member of the American Philosophical Society in 1791. In 1809 he became correspondent, and in 1823 an associate member of the Royal Institute of the Netherlands.