Abstract
A cladistic study of the sections and subsections of the genus Vernonia was performed using 32 characters. The resulting cladograms indicate that New and Old World taxa are largely distinct, but differences in topology of equally parsimonious trees indicate that the level and position of connections is unclear. The yellow-flowered trinervate-leaved species of Madagascar separate out as distinct from other Old World taxa as do the large-headed leafy-bracted species of the New World Leiboldia group. Problems are encountered with the placement of the New World subsect. Eremosis/Critoniopsis and the Old World subsectt. Strobocalyx and Urceolatae. Our analyses support the overall synoptic treatment of Jones and Jeffrey, however there are areas of phylogenetic and taxonomic difficulty which need further study. Other non-morphological characters are required to resolve problematic relationships and provide a taxonomic framework reflective of phylogenetic relationships.
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Keeley, S.C., Turner, B.L. (1990). A preliminary cladistic analysis of the genus Vernonia (Vernonieae: Asteraceae). In: Mabry, T.J., Wagenitz, G. (eds) Research Advances in the Compositae . Plant Systematics and Evolution Supplementum 4, vol 4. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6928-5_3
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DOI: https://doi.org/10.1007/978-3-7091-6928-5_3
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