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Citation for Study 12295

About Citation title: "Revised generic delimitations for Oxypolis and Ptilimnium (Apiaceae) based on leaf morphology, comparative fruit anatomy, and phylogenetic analysis of nuclear rDNA ITS and cpDNA trnQ and trnK intergenic spacer sequence data.".
About Study name: "Revised generic delimitations for Oxypolis and Ptilimnium (Apiaceae) based on leaf morphology, comparative fruit anatomy, and phylogenetic analysis of nuclear rDNA ITS and cpDNA trnQ and trnK intergenic spacer sequence data.".
About This study is part of submission 12295 (Status: Published).

Citation

Feist M.E., Downie S.R., Magee A.R., & Liu M.R. 2012. Revised generic delimitations for Oxypolis and Ptilimnium (Apiaceae) based on leaf morphology, comparative fruit anatomy, and phylogenetic analysis of nuclear rDNA ITS and cpDNA trnQ and trnK intergenic spacer sequence data. Taxon, 61(2): 402-418.

Authors

  • Feist M.E. (submitter) Phone 217 244-6858
  • Downie S.R. Phone 217-333-1275
  • Magee A.R.
  • Liu M.R.

Abstract

A phylogenetic study of Oxypolis and Ptilimnium, two small genera of tribe Oenantheae (Apiaceae, subfamily Apioideae), was carried out. Generic circumscriptions and infrageneric and infraspecific relationships were investigated through parsimony and Bayesian inference analyses of nuclear rDNA ITS and cpDNA trnQ-5'rps16 and 3'rps16-5'trnK intergenic spacer sequences. Fruit anatomical characters were examined and used in conjunction with leaf morphology to corroborate the results of the phylogenetic analyses. Each genus as currently delimited has both compound-leaved and rachis-leaved species. Results of the phylogenetic analyses show that neither Oxypolis nor Ptilimnium is monophyletic; each genus is split into two strongly supported clades that correspond to differences in leaf morphology within the groups. Fruit anatomical characters support these splits. The fruits of compound-leaved and rachis-leaved Oxypolis species differ in the number of commissural vittae per mericarp, the branching of the vittae, and the lignification of mericarp around the seed. The fruits of compound-leaved and rachis-leaved Ptilimnium species differ in the compression of the mericarps and the length of the wings relative to the vascular bundles. Based on the analyses of the molecular data and the corroboration of morphological and fruit anatomical data, new circumscriptions for the genera Oxypolis and Ptilimnium are formalized. Each of the two polyphyletic genera (Oxypolis and Ptilimnium) is split, two genera (Tiedemannia and Harperella) are resurrected, and new combinations are made.

Keywords

Harperella, new combinations, Oenantheae, Oxypolis, Ptilimnium, rachis leaves, Tiedemannia

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About this resource

  • Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S12295
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