1.Campelia zanonia, a monotypic taxon of Tradescantiae-Hexandrae, has 2n = 16 chromosomes. The karyotype consists of two pairs of long chromosomes with submedian centromeres, four pairs of medium-sized ones with subterminal centromeres among which one pair has the satellites, and two pairs of short chromosomes with subterminal centromeres.2.Neither multivalents nor chains of bivalents have been observed during meiosis. Therefore it is neither a polyploid nor a case of segmental Interchange as was previously described. It is just a normal diploid.