In 1804 and 1816, Jean Louis Marie Poiret makes the first compilation of all "Acalypha" known species in the "Encyclopédie Méthodique, Botanique" by Jean Baptiste Lamarck (vol. VI and suppl. IV). There he describes forty species, thirteen of them for the first time. In 1805, Carl Ludwig Willdenow compiles and describes thirty nine "Acalypha" species in his "Species Plantarum", in which the first classification of genus is made. The species are grouped as to whether they are monoecious or dioecious, and to the position of flowers and inflorescences. As an offspring from the American journey made by Alexander von Humboldt and Aimé Bonpland, twelve new "Acalypha" species, from Mexico and Colombia, are described by Sigmund Kunth in "Nova Genera et Species Plantarum" (1817, 1825).