Abstract
New meiotic chromosome counts are reported from 86 populations from Mexico to Ecuador of 13 species ofClibadium (Compositae, Heliantheae). These, plus previous reports, yield a total of 120 counts from 20 of the approximately 39 species recognized in the genus (Arriagada, in prep.). All counts aren=16 with a few fragments or B-chromosomes observed sporadically in some populations. One population, containing what appear morphologically to be interspecific hybrids betweenC. mexiae andC. microcephalum, showed one tetravalent and fragments. Species in both historical sections (Clibadium andTrixidium, created by Candolle and maintained by Schulz) and from the five sections to be proposed in a new classification of the genus (Arriagada, in prep.) have now been counted. The uniformity of chromosome numbers withinClibadium is correlated with observed allopatric distribution of closely related taxa.
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Stuessy, T.F., Arriagada, J.E. Chromosome counts in Clibadium (Compositae, Heliantheae) from Latin America. Brittonia 45, 172–176 (1993). https://doi.org/10.2307/2807503
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DOI: https://doi.org/10.2307/2807503