The article is dedicated to the scientific and pedagogical activity of the outstanding Russian botanist, popularizer of science, Doctor of Biological Sciences, Professor Oleg A. Korovkin, one of the founders of the Morphological School of the Timiryazev Academy. A brief biography of the scientist is given, his contribution to Russian and world science is reflected. For many years, the scientific interests of O.A. Korovkin have been related to the study of the morphogenesis of vegetative organs of flowering plants, including the ontogenesis of stoloniferous herbaceous polycarpic plants. Based on the studies, Professor Korovkin O.A. concluded that the structural unit of the shoot system of stoloniferous plants is a highly specialized shoot of vegetative reproduction. Based on the biological features of clone-forming individuals, Korovkin O.A. was the first to distinguish three types of clones in stoloniferous herbaceous polycarpic plants, the understanding of the structure of which helps modern researchers to study the ontogenesis of economically valuable stoloniforming geophytes and hemicryptophytes in more detail. Numerous scientific works of Professor Korovkin O.A. allow not only to get closer to the understanding of large and small life cycles of plants, but also to reveal the causes of the degeneration of herbaceous stoloniforming polycarpics.