A scientific meeting dedicated to the 100th anniversary of publishing one of Dr. Sava Petrović's main works «Niš Region Flora» was organized 25 years ago by a group of biologists from Doljevac, Leskovac, Prokuplje and Niš. At that time, nobody could presume that this type of botanist gathering from Serbia and surrounding countries would become one of the brightest traditions of Serbian botany at the end of previous and the beggining of this century.

1^st Centenary Symposium of „The Flora around Niš“, Niš, 30-31 May 1985
2^nd Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Leskovac, 30-31 May 1990
3^rd Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Pirot, 1-4 June 1993
4^th Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Vranje, 2-5 June 1995
5^th Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Zaječar, 5-9 June 1997
6^th Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Sokobanja, 4-7 July 2000
7^th Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Dimitrovgrad, 6-9 June 2002
8^th Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Niš, 20-24 June 2005
9^th Symposium on the Flora of Southeastern Serbia and Neighbouring Regions, Niš, 1-3 September 2007