The most prominent among them is Ramonda nathaliae, named after Queen Natalija, wife of his good friend King Milan Obrenović. In the “Supplement", Dr. Petrović cited 160 plants as new for the flora of the vicinity of Niš, though many of them were also new for science. In addition, he made corrections to some of the evident errors in the first book. Sava Petrović was the first scientist in Serbia to collect and study medicinal plants. His “Medicinal Plants of Serbia” (1883) shows fully his dedication to pharmacognosis and his contribution. He was instrumental in establishing the present-day Botanical Garden Jevremovacin Belgrade while supporting other botanical gardens with saplings grown in Belgrade. On 27 May 1872, Petrović and 15 other prominent Belgrade physicians established the Serbian Medical Society. He died on 20 January 1889, and was buried at Belgrade New Cemetery. Petrović’s legacy in botanical work is enormous. While collecting and studying flora in the vicinity of Niš, he scientifically described many plants taxa new for science which are still considered valid, while there are taxa that have kept their original names without any change: Genista, Nonea, Hypericum, Cyanus, Edraianthus, Orobanche, Psilocybe serbica, Tandonia serbica, Tulipa serbica, Ramonda serbica, Ramonda nathaliae, Primula, Hypochaeris radicata. His contributions to the List of Balkan endemic plants are many.