Ontogenetic and demographic structure of coenopopulations (CP) of the rare species Iris reticulata M.Bieb. in Quba region of Azerbaijan is described in this article. It has been revealed that all coenopopulations are left-sided, the highest percentage in CP1 and CP2 are generative individuals, in CP3 pregenerative individuals. According to the value of delta (Δ) and omega (ω) all 3 coenopopulations are “young” type. Morphometric analysis of individuals in coenopopulation and correlation analysis between morphometric parameters was performed and have been investigated the effects of climate factors to their variability and plastics. The difference in the number of rainy and frosty days, as well as in temperature degrees for 2 years has affected their morphometric features, variability and plasticity. It has been determined that the highest value between morphoparameters in CP2 are length of leaf, width of leaf, length of flower shoot, length of petal, length of root, number of roots but in CP3 width of petal, length of bulb, width of bulb. The lowest morphological measurements were observed in CP1. The variation coefficients showed that in all three coenopopulations the least varied is length of root (10–12%) and high varied of length of flower shoot (33–35%). In all coenopopulations, the most plastic morphoparameter is length of flower shoot (0.6–0.62), in addition to CP2 and CP3 -width of leaf (0.67–0.72). The least plastic is length of root (0.25–0.28) for all CP. The result of correlation analysis showed that the strong correlation between the parameters in all three coenopopulations is the length of flower shoot ~ length of bulb. Investigations showed that anthropogenic and natural factors affect the decreasing the number of I. reticulata in the study area.