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Abstract: The article assesses the state of the ontogenetic structure of the rare species Crambe edentulaFisch. & C.A. Mey. ex Korsh., which grows in the Karakalpak part of Ustyurt. The study showed that in the ecological-cenotic conditions of Ustyurt, the studied local populations are normal and mostly incomplete. The characteristic ontogenetic spectrum for C. еdentulais centered due to an increase in the life span of individuals in a mature generative state and poor seed renewal. The ontogenetic spectra of local populations do not coincide with the characteristic spectra. The spectra of specific local populations are left-sided and right-sided, which is associated with the environmental conditions of habitation and fluctuations in weather conditions.