Ontogenetic age features of the rare and endangered Cotinus coggygria scop. species in the flora of Azerbaijan have been given in the paper. The phytocenotic characteristics and ontogenetic structure of populations of the Cotinus coggygria species of the Anacardiaceae Lindl family were revealed during the study of rare plants. Narrow range and low abundance of species was found. The maxima was found for the species in the ontogenetic spectra fall on the generative (g2 - g3 groups. Young individuals (j, im, v and g1) are the most threatened. All developmental stages starting from the process of fertilization were studied for this plant and the full life cycle was divided into 4 periods. The condition and rarity of cenopulations have been identified.