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SUMMARY
A study of mitosis in root tips revealed E. atropurpureus and E. kiautschovicus to have n = 16, while n = 32 was recorded for E.alatus and E.Fortunei forma coloratus. Karyotypic analysis could not be undertaken due to the smallness of the chromosomes and the lack of morphological detail. Two different chromosome numbers were observed in the collective taxon E. Fortunei.
Microsporogenesis was found to be highly regular in E. atropurpureus and E. kiautschovicus, with the exception of irregular quartet formation in 5% of the microsporocytes of the latter species.
E. americanus and E. alatus appear to be segmental allopolyploids. Weak asynapsis was evident in these two tetraploid species. Precocious chromosome movement at anaphase II occurred in E. americanus.
The genus Euonymus may reveal interesting relationships from the aspects of hybridization, polyploidy, and apomixis.
