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Open Access Documentation of the Chromosome Number for Zigadenus glaberrimus (Liliales: Melanthiaceae) and its Significance in the Taxonomy of Tribe Melanthieae

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Abstract:

Abstract—

The monotypic genus Zigadenus occupies a critical position in the evolution of Melanthieae as sister to the clade comprising the rest of the genera in the tribe. Meiotic (n = 27) and mitotic (2n = 54) chromosome counts for Zigadenus glaberrimus documented here do not support a long-standing tentative report of 2n = 52. The likely base chromosome number of the tribe and significance of chromosome numbers as generic synapomorphies are discussed in reference to these newly recorded counts for Zigadenus glaberrimus, a likely hexaploid.

Keywords: Chromosomal evolution; Cytology; Phylogeny; Polyploidy

Document Type: Research Article

DOI: http://dx.doi.org/10.1600/036364414X680951

Publication date: June 1, 2014

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