An investigation was undertaken to study the cytomorphology of the interspecific hybrid H. annuus var. Morden x H. argophyllus along with the parents. The hybrid showed considerable vigour for plant height and stem girth. The hybrid was intermediate for seed size and test weight and exhibited reduced pollen and seed fertility. The chromosome pairing was normal in the parents while one chain or ring quadrivalent was observed in the hybrid in most of the meiotic cells scored in diakinesis / metaphase I, suggesting that the species H. annuus and H. argophyllus differ by one reciprocal translocation. The mean chiasmata frequency in the hybrid was 20.94 per cell and 1.22 per bivalent, while for H. annuus and H. argophyllus the values were 22.76, 22.16 per cell and 1.33, 1.33 per bivalent, respectively.