Phenolic compounds from leaves of 19 apomictic Potentilla biotypes, belonging to seven different species, were studied by means of thin-layer chromatography, together with material of Fragaria vesca. Leaves were collected for analysis from both young and mature plants within each biotype. More than 100 different spots were observed in the chromatograms of the total material. Obvious differences were found between species, and, to a smaller extent, between apomictic biotypes within the same species. However, pronounced differences were also observed between chromatograms from young and mature plants. The experimental results point to the necessity of careful choice of plant material for chemotaxonomic comparisons. The usefulness of chemotaxonomic methods in the study of apomictic form groups is discussed.