A New Species of Polymnia (Asteraceae: Tribe Polymnieae) from Tennessee
Abstract:Polymnia johnbeckii , a new, narrowly endemic species, is distinct in its combination of highly dissected leaves, hirsute herbage, and relatively large, showy heads. It is known from two populations in Marion County, Tennessee, and should be considered a rare species at both the state and federal level. A chromosome count indicates that P. johnbeckii is diploid. Although standard cladogenesis is the null hypothesis for the origin of this diploid species, evidence supporting an alternative scenario of homoploid hybrid speciation is discussed.
Document Type: Research Article
Publication date: April 1, 2011
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- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
2011 Impact Factor: 1.517
2011 ISI Journal Citation Reports® Rankings: 87/190 - Plant Sciences
34/45 - Evolutionary Biology
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