Unusual Cytological Patterns in Pollen Mother Cells of Camellia in Cultivated Populations

All the meiotic irregularities found in pollen mother cells in cultivated taxa of Came-llia with hybrid heterozygosity as the major cause of genetic unbalance are probably responsible for some portion of the production of abortive pollen in Camellia. Unusual cytological patterns are, in this case, found more frequently in intersectional, interspe-cific hybrids, particularly in hybrids between different ploid levels and high-ploid taxa.