Testing Hybridization Hypotheses with Morphometry: the Case of Eastern American Arctic Species of Potentilla sect. Niveae (Rosaceae)
Asexual reproduction, polyploidy and hybridization are well-known sources of taxonomic complexity in angiosperms. All these processes are believed to occur in Potentilla sect. Niveae (Rosaceae). Although it has been assumed that hybridization is common in section Niveae, this hypothesis has not been tested and recent studies suggest that phenotypic plasticity may sometimes better explain morphological intermediates in nature. To clarify the role of hybridization in the evolution of section Niveae, we tested two hybridization hypotheses for its eastern American Arctic species. The first is a potential hybrid between Potentilla nivea and Potentilla arenosa, and the second between Potentilla arenosa and Potentilla vahliana sensu lato. Twenty-four quantitative and 12 qualitative morphological characters were scored on specimens sampled from a representative range of the parental species and putative hybrids in the American Arctic east of the 100th meridian. Multivariate analyses showed that these two classes of characters give a congruent signal and that species form separate groups. Morphological evidence appears to give support to the hybridization hypothesis both between Potentilla arenosa and Potentilla nivea and between Potentilla arenosa and Potentilla vahliana sensu lato, although other explanations may also be conceivable. We discuss potential implications for the taxonomy of Potentilla and the study of hybridization in apomictic groups.
Document Type: Research Article
Publication date: March 1, 2014
More about this publication?
- 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
- Editorial Board
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- Ingenta Connect is not responsible for the content or availability of external websites