Abstract
Cross‐compatibility, morphology, cytology and fertility were determined for six 18‐chromosome Linum taxa and nine of their “interspecific” hybrids. Meiosis in all parental materials was regular. In hybrids, meiosis was characterized by univalents and multiple chromosome associations at metaphase I. Chromosome pairing indicated that L. altaicum differs from L. alpinum, L. austriacum, L. julicum, L. narbonense, and L. perenne by one reciprocal translocation. L. austriacum and L. narbonense, and L. julicum and L. narbonense also apparently differ by one translocation, whereas L. perenne and L. narbonense appear to differ by two translocations. Chromosomes not involved in translocations formed normal bivalents indicating that they, in general, were homologous. Evolution of these taxa parallels speciation patterns through chromosomal reorganization.
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