Abstract
Various hybrid combinations of 18 species and varieties ofAquilegia were produced, and several cross-pollinations were made which failed to produce hybrids. Pollen fertility of hybrids was generally high, with a total mean of approximately 50%, but highly variable among hybrid combinations and consistently lower than that of parental species. With the exception of frequent occurrence of giant pollen grains and rare synaptic failure of one or two homologous pairs, meiotic behavior in hybrid pollen mother cells appeared to be completely regular.
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