rbcL sequences support exclusion ofRetzia,Desfontainia, andNicodemia from theGentianales |
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| Authors: | Birgitta Bremer Richard G. Olmstead Lena Struwe Jennifer A. Sweere |
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| Affiliation: | (1) Department of Systematic Botany, Uppsala University, Villav. 6, S-752 36 Uppsala, Sweden;(2) Department of E.P.O. Biology, University of Colorado, 80309 Boulder, Colorado, USA;(3) Laboratory of Molecular Systematics, National Museum of Natural History, Smithsonian Institution, 20560 Washington, D.C., USA |
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| Abstract: | The taxonomic positions ofRetzia, Desfontainia, andNicodemia have been much discussed, and all three genera have been included inLoganiaceae (Gentianales). We have made a cladistic analysis ofrbcL gene sequences to determine the relationships of these taxa toGentianales. Four newrbcL sequences are presented; i.e., ofRetzia, Desfontainia, Diervilla (Caprifoliaceae), andEuthystachys (Stilbaceae). Our results show thatRetzia, Desfontainia, andNicodemia are not closely related toLoganiaceae or theGentianales. Retzia is most closely related toEuthystachys and is better included inStilbaceae. The positions ofDesfontainia andNicodemia are not settled, butDesfontainia shows affinity for theDipsacales s.l. andNicodemia for theLamiales s.l. |
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| Keywords: | Gentianales Loganiaceae Stilbaceae Desfontainia Diervilla Euthystachys Nicodemia Retzia Chloroplast DNA rbcL cladistic analysis |
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