Among 20 euploid (2n = 28) plants of D. glomerata selected from open-pollinated populations, data on chromosomal behavior during meiosis were obtained from 2 dates of collection for 12 and from 1 collection for 8 plants. Using data from plants with 2 dates of collection, statistically significant differences among plants were found for quadrivalent fre-quency per sporocyte, metaphase I sporocytes with uni-valents, and quartets with micronuclei. For frequency of anaphase I laggards the differences among plants were on the borderline of significance. The difference between dates of collection was significant in all cases. Among the 20 plants, there was a range from 2.42 to 4.39 quadrivalents per sporocyte, 0 to 16.8% of metaphase I sporocytes with univalents, 1.7 to 34% of anaphase I with lagging uni-valents, and 1.5-25.6% of quartets with micronuclei. Quadrivalent frequency was not correlated with % of metaphase I sporocytes having univalents, % of anaphase I sporocytes with laggards, or % of quartets with micronuclei. Significant correlation coefficients were obtained between metaphase I sporocytes with univalents and anaphase I with laggards, between metaphase I with univalents and quartets with micronuclei, and between anaphase I with laggards and quartets with micronuclei. In 18 of the plants, dicentric chromatid bridges and acentric fragments were observed at anaphase I.