The genus Collinsia. n. Interspecific hybrids involving C. heterophylla, C. concolor, and C. sparsiflora
Garber, E.D.; Gori, J.
Bot Gaz 118(1): 73-77
Crosses involving C. heterophylla, C. concolor, and C. sparsiflora, all 2n=14, yielded 2n and 3n hybrids. Hybrids between C. heterophylla and C. concolor displayed greatly reduced fertility; hybrids involving C. sparsiflora were completely sterile. Diploid hybrids of C. heterophylla and C. concolor had only bivalents at MI; diploid hybrids involving C. sparsiflora had univalents, bivalents, trivalents, and quadrivalents at the same stage and approximately 20% of the PMC's had 1 or 2 di-centric chromatid bridges plus fragment(s) at TL No preferential pairing was obvious in 3n hybrids of C. heterophylla and C. concolor; preferential pairing was detected in 3n hybrids of C. sparsiflora and C. heterophylla, the duplicated genome belonging probably to C. sparsiflora, on the basis of the mean number of chiasmata per bivalent at MI. The genomes of C. heterophylla and C. concolor have been assigned the letters S1 and S2, respectively, and the genome of C. sparsiflora, P1.