<p>The anatomical and morphological structure of vegetative organs Adenium obesum of different ages of the preregenerative period were investigated. It is known that plants of this type are included in the list of CITEC, as their numbers in nature is constantly decreasing. The representatives of Adenium obesum is a popular ornamental plant, and characterized by broad medical and biological characteristics (antibacterial, anti–cancer, antiviral, antioxidant, etc.). The plants of this type belong

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... to the succulents by thickening of the basal part of the stem. However, scientific information regarding the anatomical and morphological researches, characteristics and formation of thickened basal part of the stem is not enough known. As a result of investigations it was found, that after germination the hypocotyl part of plants constantly increase and thickens to form a thickened basal part of the stem. The thickening occurs of the cortical–medullary type. The upper part of the stem and general root significantly thickening only in border areas of the basal part. The periderm formation in the early stages of ontogenesis of A. obesum probably caused by adaptation to life in the arid climate conditionsIt also became known that the representatives of this type are well developed the excretory tissue as non–articulate lactiferous vessels, which, our opinion, are, synthesized most biologically active substances. Confirmed that succulent, woody plant Adenium obesum is caudiciform plant and in the growth process forming «caudex».</p>