DISTRIBUTION AND RESOURCES EVALUATION OF TRIBULUS TERRESTRIS L. (ZYGOPHYLLACEAE) POPULATION IN THRACIAN FLORISTIC REGION

Tribulus terrestris is an annual medicinal plant. Its row material is collected for industrial uses from the nature. The distribution of its populations as well as the quantity of the drug production (productivity) in specific sites and conditions were studied. Thirty three economically significant localities were established in the Thracian floristic region during 2009, distributed on area of 1314 dka, which could give about 90 tons of dry drug annually. The biomass production of every area was affected by the change in the environmental conditions. The best populations for collection and production of pharmaceutical drug and international trade were determined.