Buckwheat is an allogamous species, which is pollinated by insects. The species is distinguishing by a flower dimorphism and a great number of self-sterility genes. Therefore, it is characterized by a large intraspecies variation. The aim of the study was to compare the variation of yielding characters of Red corolla form, of Hruszowska cv., which is one of the initial forms for Red corolla, and Kora cv. Kora is a cultivar of the biggest cultivation acreage. The studies were a part of breeding work, whose aim was to form buckwheat of a stable crop and of a reduced amount of green mass, which is useful for harvesting. The obtained results showed that Hruszowska cv. was distinguishing by a slightly larger variation of the tested characters than Kora cv. and Red corolla form. The seed weight, the plant weight and the number of seeds were characterized by the highest variability. However, the number of nodes on the main shoot (Kora cv. = 17.8%, Hruszowska cv. V = 17.9% and Red corolla form V = 10.2%), the height (Kora cv. V = 18.5%, Hruszowska cv. V = 14.3% and Red corolla form = 15.9%), the thousand seed weight (Kora cv. V = 12.4%, Hruszowska cv. = 11.6% and Red corolla form V = 12.9%), the height of the first inflorescence (Kora cv. V = 18.3%, Hruszowska cv. V = 20.1% and Red corolla form V = 17.8%) and the length of the florescence area (Kora cv. V = 26.1%, Hruszowska cv. V = 25.8% and Red corolla form V = 25.4%) were most stable characters. The largest differences in the variability coefficient were found for the number of seeds per plant (Kora cv. V = 65.8%, Hruszowska cv. V = 65.2% and Red corolla form V = 71.6%), seed weight (Kora cv. V = 61.8%, Hruszowska cv. V = 69.0% and Red corolla form V = 68.0%) and the number of seeds in one inflorescence (Kora cv. V = 44.1%, Hruszowska cv. V = 44.0% and Red corolla form V = 49.9%).
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