Abstract
1. Diploid and triploid hybrids were found in crosses involving Collinsia heterophylla, C. concolor, and C. sparsiflora. Hybrids of C. heterophylla and C. concolor had reduced fertility; hybrids involving C. sparsiflora were completely sterile. 2. Diploid hybrids of C. heterophylla and C. concolor had only bivalents at metaphase I; diploid hybrids involving C. sparsiflora had univalents, bivalents, trivalents, and quadrivalents at the same stage, and approximately 20% of the pollen mother cells had one or two dicentric chromatid bridges and one or two fragments at telophase I. 3. Univalents, bivalents, and trivalents were observed at metaphase I in the triploid hybrid of C. heterophylla and C. concolor. Although similar chromosome associations occurred at the same stage in the triploid hybrid of C. heterophylla and C. sparsiflora, there was evidence of preferential pairing for the duplicated genome. The chiasma frequency per bivalent in the latter hybrid indicated that the duplicated genome belonged to C....
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