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Cryptic goldfields: a molecular phylogenetic reinvestigation of Lasthenia californica sensu lato and close relatives (Compositae: Heliantheae sensu lato)
Author(s) -
Chan Raymund,
Baldwin Bruce G.,
Ornduff Robert
Publication year - 2002
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.89.7.1103
Subject(s) - biology , sensu , monophyly , maximum parsimony , clade , lineage (genetic) , concerted evolution , ribosomal dna , species complex , internal transcribed spacer , molecular phylogenetics , heliantheae , phylogenetic tree , botany , evolutionary biology , zoology , genetics , genus , gene , asteraceae
Maximum parsimony analysis of DNA sequence data from the internal and external transcribed spacer (ITS and ETS) regions of 18S–26S nuclear ribosomal DNA and the 3′ trn K intron of chloroplast DNA from over 60 populations of Lasthenia sect. Amphiachaenia yielded a well‐supported tree showing that the most common species of Lasthenia , L. californica sensu lato (s.l.), is not monophyletic. Members of Lasthenia californica s.l. belong to two well‐supported but morphologically cryptic clades. One clade includes members of L. macrantha ; the other represents a basally divergent lineage in L . sect. Amphiachaenia . Members of each clade can be diagnosed by pappus morphology and by geographic distribution, except for epappose plants that occur in a broad region of sympatry in central California. Overall diversification in the clade corresponding to L . sect. Amphiachaenia has been accompanied by minimal morphological divergence, which has resulted in previously underappreciated cryptic diversity.