Supplementum Plantarum Systematis Vegetabilium Editionis Decimae Tertiae, Generum Plantarum Editiones Sextae, et Specierum Plantarum Editionis Secundae, commonly abbreviated to Supplementum Plantarum Systematis Vegetabilium or just Supplementum Plantarum, and further abbreviated by botanists to Suppl. Pl., is a 1782 book by Carolus Linnaeus the Younger. Written entirely in Latin, it was intended as a supplement to the 1737 Genera Plantarum and the 1753 Species Plantarum, both written by the author's father, the "father of modern taxonomy", Carolus Linnaeus.
The cover page indicates that it was published in 1781, and it was long believed to have been published in October of that year. In 1976, however, Hermann Manitz used a letter written by Jakob Friedrich Ehrhart to show that it had in fact been published in April 1782.