Molecular phylogeny of the North American eurybioid asters (Asteraceae, Astereae) based on the nuclear ribosomal internal and external transcribed spacersThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

  title={Molecular phylogeny of the North American eurybioid asters (Asteraceae, Astereae) based on the nuclear ribosomal internal and external transcribed spacersThis paper is one of a selection of papers published in the Special Issue on Systematics Research.},
  author={Sugirthini Selliah and Luc Brouillet},
The eurybioid asters Oreostemma, Herrickia, Eurybia, and Triniteurybia form a complex that is part of the North American clade of tribe Astereae. They comprise 31 species of perennial herbs that ar... 
Systematics of Symphyotrichinae (Asteraceae: Astereae): Disagreements between Two Nuclear Regions Suggest a Complex Evolutionary History
Abstract The systematics of subtribe Symphyotrichinae were studied with sequence data from two nuclear regions: the 18S–26S nrDNA internal and external transcribed spacers (ITS and ETS) and the 5S
Conservatism of responses to environmental change is rare under natural conditions in a native grassland
The results suggest that conservatism of the response niche is not common, but is actually rare, and evolutionary relationships are likely to be of limited relevance for predicting species responses under field conditions, at least over the short time scales used in this study.


Molecular phylogeny of Ericameria (Asteraceae, Astereae) based on nuclear ribosomal 3' ETS and ITS sequence data
Ericameria, Pentachaeta, Rigiopappus and Tracyina are resolved in a monophyletic group distinct from Chrysothamnus, Xylothamia, and representatives of the Solidago lineage.
Internal transcribed spacer sequence analyses indicate cytoevolutionary patterns within Brachycome Cass. (Asteraceae)
The sequences of the Internal Transcribed Spacer regions (ITS1 and ITS2) within the genes coding for cytoplasmic ribosomal RNAs on the A chromosome complement of 34 members of the higher plant genus Brachycome have been compared to support the suggestion that the number of chromosomes reduced in several independent Brachy Come lineages during speciation.
ITS sequence data support a single origin for North American Astereae (Asteraceae) and reflect deep geographic divisions in Aster s.l.
Preliminary Parsimony analyses indicate that all North American Astereae are members of a strongly supported clade, and that a diverse group of predominantly woody taxa from Africa, Australia, and South America, are basalAstereae.
Phylogeny of Tragopogon L. (Asteraceae) Based on Internal and External Transcribed Spacer Sequence Data
ITS and ETS sequence data provide strong support for the monophyly of Tragopogon under parsimony optimality criteria and indicate possible relationships for 17 species that had not been previously placed in any section.
Phylogenetic relationships among diploid species of Symphyotrichum (Asteraceae: Astereae) based on two nuclear markers, ITS and GAPDH.
Two nuclear markers are used, the nrDNA internal transcribed spacer (ITS) and the low-copy nuclear gene glyceraldehyde 3-phosphate dehydrogenase (GAPDH), to resolve intergeneric and interspecific relationships within the subtribe at the diploid level, and to determine whether the phylogenies validate the classifications of Nesom or Semple.
Molecular confirmation of the hybrid origin of Eupatorium godfreyanum (Asteraceae).
The ITS sequence data supported the hypothesis that Eupatorium godfreyanum is of hybrid origin from a combination of E. rotundifolium and E. sessil ifolium, and suggested that there was little phylogenetic structure within the data beyond a basal split between members of the dog fennel group and the remainder of the genus.
Higher-Level Relationships and Major Lineages of Lessingia (Compositae, Astereae) Based on Nuclear rDNA Internal and External Transcribed Spacer (ITS and ETS) Sequences
This work focuses on the major evolutionary lineages within Lessingia (sensu Lane 1992) and the higher-level relationships of the genus and presumed close relatives using sequence data from the 18S–26S nuclear ribosomal DNA (nrDNA) internal transcribed spacer (ITS) region and the 3’ end (561–563 bp) of the external transcribedSpacer (ETS).
Data on chromosome numbers in Aster (Asteraceae), with comments on the status and relationships of certain North American species
With new data available, the basic chromosome number ofx = 8 has now been confirmed for all species of Aster sectionHeterophylli, except the Mexican A.coahuilensis.
A classification of the New World species of Aster (Asteraceae)
A scheme of infrageneric classification is presented which utilizes the basic chromosome number as a pivotal diagnostic character and ten subgenera of the genus Aster, five of them subdivided further into a total of 24 sections, are recognized as having representative species in the New World.
Molecular Phylogeny of Chrysothamnus and Related Genera (Asteraceae, Astereae) Based on Nuclear Ribosomal 3′ ETS and ITS Sequence Data
The results indicate that Chrysothamnus as traditionally perceived is polyphyletic, with species placed in four well-supported lineages, and some of the morphological features used to delimit these genera may be the product of convergence, thus diminishing their value for phylogenetic reconstruction.