Phylogeny of eastern North American Coreopsis (Asteraceae-Coreopsideae): insights from nuclear and plastid sequences, and comments on character evolution

A molecular phylogenetic study of eastern North American Coreopsis and representatives of other genera of tribe Coreopsideae was conducted using combined sequences from nuclear ITS and two plastid regions (matK, rpl16). A total of 25-30 species has been recognized in five sections of Coreopsis in ea...

Full description

Saved in:
Bibliographic Details
Published in:American journal of botany 2005-02, Vol.92 (2), p.330-336
Main Authors: Crawford, Daniel J., Mort, Mark E.
Format: Article
Language:English
Subjects:
annuals
Asteraceae
Biological taxonomies
character evolution
color
Coreopsis
Evolution
florets
fruits (plant anatomy)
Genera
Internal transcribed spacers
leaves
Ligules
molecular phylogeny
molecular sequence data
molecular systematics
nuclear genome
nucleotide sequences
Parsimony
Phylogenetics
Phylogeny
plant genetics
plant morphology
plant taxonomy
plastid DNA
Systematics
Taxa
taxonomic revisions
We they distinction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A molecular phylogenetic study of eastern North American Coreopsis and representatives of other genera of tribe Coreopsideae was conducted using combined sequences from nuclear ITS and two plastid regions (matK, rpl16). A total of 25-30 species has been recognized in five sections of Coreopsis in eastern North America. Based on morphological characters, these taxa have generally been considered a monophyletic group. Our well-resolved phylogeny supports the monophyly of sections that have been recognized in Coreopsis, but the sections collectively do not comprise a monophyletic group because species of north temperate Bidens occur within one of the two major Coreopsis clades. The most notable departure of present results from prior views of relationships among sections is the lack of a sister group relationship between sections Calliopsis and Eublepharis; the shared presence of four-lobed disk floret corollas had been used to support a close relationship between these two sections. Relationships within sections show both similarities and differences with the results of previous studies based primarily on morphological characters. Mapping of morphological characters used taxonomically in Coreopsis and related genera onto the phylogeny indicates that the evolution of these characters has been complex, and this compromises their value for defining monophyletic groups. Examples include the annual habit, alternate leaves, winged fruits, red or brown basal spots on the yellow ligules, and four-lobed disk floret corollas.
ISSN:0002-9122
1537-2197
DOI:10.3732/ajb.92.2.330