Abstract
Karyotype analysis of Collinsia verna and C. heterophylla revealed seven pairs of chromosomes with a decrease in length of chromosomes across each genome from approximately 11 microns to 5 microns. The smallest pair is knobbed in both species. A change in centromere position in the two longest chromosomes between the two species is indicative of the presence of chromosomal rearrangements such as pericentric inversions. Interspecific hybrids produced meiotic cells with many abnormalities including desynapsis and heteromorphic bivalents. This analysis revealed new cytological information and involved a hybrid cross between two groups of Collinsia species which had previously produced no fertile hybrids.
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