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Citation for Study 1957

Citation title: "A phylogenetic study of Oxypolis and Ptilimnium (Apiaceae) based on nrDNA ITS sequence data".

This study was previously identified under the legacy study ID S1939 (Status: Published).

Citation

Feist M., & Downie S. 2007. A phylogenetic study of Oxypolis and Ptilimnium (Apiaceae) based on nrDNA ITS sequence data. Systematic Botany, null.

Authors

• Feist M.
• Downie S.

Abstract

Oxypolis and Ptilimnium are two endemic genera of North America within tribe Oenantheae (Apiaceae subfamily Apioideae). Both genera are small, with 12 species currently recognized. Some members of each genus share an unusual leaf morphology. Rather than having the pinnately compound leaves that generally characterize apioid umbellifers, they have highly reduced, linear, terete, hollow, septate appendages known as rachis leaves. It has long been questioned whether the species with rachis leaves should be placed in separate genera. In this study, we use data from the internal transcribed spacer region of nuclear ribosomal DNA to explore relationships within and between these genera. A total of 147 internal transcribed spacer sequences were obtained from multiple accessions of all species of Oxypolis and Ptilimnium and for several outgroups from tribe Oenantheae. These included Lilaeopsis, which also has rachis leaves, and Cynosciadium and Limnosciadium, which have rachis-like leaves. These sequence data were analyzed using maximum parsimony, maximum likelihood, and Bayesian methods. The results from each of these analyses were congruent and suggest that neither Oxypolis nor Ptilimnium as presently defined is monophyletic. Oxypolis and Ptilimnium are each separated into two clades according to leaf morphology. The rachis-leaved Oxypolis species are provisionally recognized as the genus Tiedemannia and the rachis-leaved Ptilimnium species are provisionally recognized as the genus Harperella, pending further investigation. The relationships among these four clades and the genera Cynosciadium, Daucosma, and Limnosciadium are not clear. Nevertheless, it appears that the rachis-leaf habit has evolved multiple times in the tribe. Geographic structure is apparent in the phylogenetic trees and, pending further study, may suggest new taxa; in addition, the presence of O. occidentalis on the Queen Charlotte Islands, well-separated from other populations of this species, suggests that it may have survived the last glaciation in a refugium in this area.

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S1957
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref15398,
  	 author = {Mary Ann Elizabeth  Feist and Stephen R.  Downie},
  	 title = {A phylogenetic study of Oxypolis and Ptilimnium (Apiaceae) based on nrDNA ITS sequence data},
  	 year = {2007},
  	 keywords = {},
  	 doi = {},
  	 url = {},
  	 pmid = {},
  	 journal = {Systematic Botany},
  	 volume = {},
  	 number = {},
  	 pages = {},
  	 abstract = {Oxypolis and Ptilimnium are two endemic genera of North America within tribe Oenantheae (Apiaceae subfamily Apioideae). Both genera are small, with 12 species currently recognized. Some members of each genus share an unusual leaf morphology. Rather than having the pinnately compound leaves that generally characterize apioid umbellifers, they have highly reduced, linear, terete, hollow, septate appendages known as rachis leaves. It has long been questioned whether the species with rachis leaves should be placed in separate genera. In this study, we use data from the internal transcribed spacer region of nuclear ribosomal DNA to explore relationships within and between these genera. A total of 147 internal transcribed spacer sequences were obtained from multiple accessions of all species of Oxypolis and Ptilimnium and for several outgroups from tribe Oenantheae. These included Lilaeopsis, which also has rachis leaves, and Cynosciadium and Limnosciadium, which have rachis-like leaves. These sequence data were analyzed using maximum parsimony, maximum likelihood, and Bayesian methods. The results from each of these analyses were congruent and suggest that neither Oxypolis nor Ptilimnium as presently defined is monophyletic. Oxypolis and Ptilimnium are each separated into two clades according to leaf morphology. The rachis-leaved Oxypolis species are provisionally recognized as the genus Tiedemannia and the rachis-leaved Ptilimnium species are provisionally recognized as the genus Harperella, pending further investigation. The relationships among these four clades and the genera Cynosciadium, Daucosma, and Limnosciadium are not clear. Nevertheless, it appears that the rachis-leaf habit has evolved multiple times in the tribe. Geographic structure is apparent in the phylogenetic trees and, pending further study, may suggest new taxa; in addition, the presence of O. occidentalis on the Queen Charlotte Islands, well-separated from other populations of this species, suggests that it may have survived the last glaciation in a refugium in this area.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 15398
  AU  - Feist,Mary Ann Elizabeth 
  AU  - Downie,Stephen R. 
  T1  - A phylogenetic study of Oxypolis and Ptilimnium (Apiaceae) based on nrDNA ITS sequence data
  PY  - 2007
  KW  - 
  UR  - 
  N2  - Oxypolis and Ptilimnium are two endemic genera of North America within tribe Oenantheae (Apiaceae subfamily Apioideae). Both genera are small, with 12 species currently recognized. Some members of each genus share an unusual leaf morphology. Rather than having the pinnately compound leaves that generally characterize apioid umbellifers, they have highly reduced, linear, terete, hollow, septate appendages known as rachis leaves. It has long been questioned whether the species with rachis leaves should be placed in separate genera. In this study, we use data from the internal transcribed spacer region of nuclear ribosomal DNA to explore relationships within and between these genera. A total of 147 internal transcribed spacer sequences were obtained from multiple accessions of all species of Oxypolis and Ptilimnium and for several outgroups from tribe Oenantheae. These included Lilaeopsis, which also has rachis leaves, and Cynosciadium and Limnosciadium, which have rachis-like leaves. These sequence data were analyzed using maximum parsimony, maximum likelihood, and Bayesian methods. The results from each of these analyses were congruent and suggest that neither Oxypolis nor Ptilimnium as presently defined is monophyletic. Oxypolis and Ptilimnium are each separated into two clades according to leaf morphology. The rachis-leaved Oxypolis species are provisionally recognized as the genus Tiedemannia and the rachis-leaved Ptilimnium species are provisionally recognized as the genus Harperella, pending further investigation. The relationships among these four clades and the genera Cynosciadium, Daucosma, and Limnosciadium are not clear. Nevertheless, it appears that the rachis-leaf habit has evolved multiple times in the tribe. Geographic structure is apparent in the phylogenetic trees and, pending further study, may suggest new taxa; in addition, the presence of O. occidentalis on the Queen Charlotte Islands, well-separated from other populations of this species, suggests that it may have survived the last glaciation in a refugium in this area.
  L3  - 
  JF  - Systematic Botany
  VL  - 
  IS  - 
  ER  -