Artificial Hybridization of the Genera Zinnia (Sect. Mendezia) and Tragoceras (Compositae-Zinninae)

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Abstract
Morphological and cytological observations onZinnia-Tragoceras hybrids are presented. At the diploid level, the cytology of the artificial hybrids indicates thatZinnia sect.Mendezia andTragoceras share a common genomic background, and that the divergence of the two genera has been accompanied by reciprocal translocations involving nonhomologous chromosomes. Diakinesis associations in artificial tetraploids of the hybrids have been used to shed light on the extent of chromosome homology of the parents. As a result of this studyTragoceras has been merged intoZinnia as a new section.

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