Abstract
AbstractSpecies of the genus Vernonia used in this study were collected from their natural habitats in the savannah and degraded savannah vegetation in Nigeria. The chromosome counts for eight of the taxa are reported for the first time. Karyological data for the species are being reported for the first time, even though some of the species have had their chromosome counts reported in Nigeria or elsewhere.The chromosome data show that the species of Vernonia fall under two base‐number categories of x = 9 and x = 10. Species with different growth habits had similar chromosome numbers with similarities in the size and the morphology of their chromosomes. The x = 9 materials were more derived (specialized) than those of x = 10; and hence with more aggressive colonization trait. Some members of the x = 10 group were poor colonizers remaining only in their restricted ecovegetational niche.
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