Chromosome Numbers and Karyotypes in Borrichia (Compositae)

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Abstract
The karyotypes of B. frutescens and B. arborescens and that of their hybrid, B. .times. cubana, are very similar. The 74 populations sampled contained diploid individuals (n = 14II), but 1 contained several triploid individuals (2n = 42) as well. Some aneuploidy may be present in southern populations of B. arborescens, but otherwise the genus is stable cytologically with x = 14.

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