Species Relationships in Krameria (Krameriaceae) Based on ITS Sequences and Morphology: Implications for Character Utility and Biogeography
The Krameriaceae is a monotypic family of 18 species distributed in the warm arid and semiarid regions of North and South America. We have used sequence data from the internal transcribed spacer region of the nuclear ribosomal DNA repeat (ITS 1, 5.8S, and ITS 2) and morphology to infer relationships within Krameria. Using Kallstroemia parviflora, Guaiacum angustifolium, and Tribulus terrestris, three North American members of the Zygophyllaceae, as out groups, our data provide evidence for two major clades in the genus, each containing a North and a South American subclade. Both the major clades and subclades are supported by morphological synapomorphies. The phylogeny does not provide an unequivocal resolution as to the hemisphere in which Krameria arose, but it does indicate an initial split leading to the ancestors of the two clades, each of which subsequently produced radiations in North and South America. Therefore, there must have been two independent dispersals to, or two vicariant episodes involving, North and South America.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 2004-01-01
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