The best known of Boym's works is the "Flora Sinensis" ("Chinese Flora"), published in Vienna in 1656. The book was the first description of an ecosystem of the Far East published in Europe. Boym underlined the medicinal properties of the Chinese plants. The book also included pleas for support of the Catholic Chinese emperor and a poem containing nearly a hundred chronograms pointing to the date of 1655, the date of coronation of Emperor Leopold I as the King of Hungary, as Boym wanted to gain support of that monarch for his mission.