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It was formed and registered in NCPGRU trait collection of maize inbred lines by the number of grain rows including 135 samples. There is presented distribution of the lines for this trait in conjunction with the distribution on the maturity groups. All early-maturing lines have an average level of the number of grain rows (14-16 rows). The same level was observed in 82% of middle-ripening and 69% of middle-late lines. Multi-row samples (18-20 rows) belong to middle-ripening (16 samples) and middle-late (11 samples) groups accounting for 17 and 31%, respectively. The sample with the highest number of rows (22) UHS 95 belongs to the middle-ripening. The lines with high and very high levels of a given trait comprise 21% and do not occur in the group of middle-early lines.