The variability of morphological characters of 25 maize inbred lines was studied. Inbreds developed at plant breeding station Kobierzyce consisted of 16 dents, 5 flints and 4 semidents. The degree of inbred ranged from S₈ to S₂₀. The following characters were evaluated: smut infection, root lodging, days from planting to pollen shedding and silking, plant height, ear length, ear diameter, cob diameter, no. of grain rows, no. of grains/ear and grain weight/ear. It was shown that there were differences beteen the lines in regard to the analysed characters. The highest degree of genetic differentiation was found for plant height (h² = 0.94), no. of grains/ear (h² = 0.63) and ear height (h² = 0.57). Low values of genetic variability were calculated for ear length, ear diameter and cob diameter. Out of 25 lines, 17 showed resistance to lodging, whereas two (K 401, K 427) lodged heavily. Smut infection was observed in five lines: K 355, K 372, K 378, K 389 and K 424. The earliest lines were K 341 and K 388 scoring 75 days from planting to silking. Lines K 427, K 423, K 424 and K 420 were late and flowered after 90 days. A few plants in lines K 401, K 420 and K 343 failed to develop ears.
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